Crown of Castile in the context of 1383–1385 Portuguese interregnum

Spain, officially the Kingdom of Spain, is a country in Southern and Western Europe with territories in North Africa. Featuring the southernmost point of continental Europe, it is the largest country in Southern Europe and the fourth-most populous European Union (EU) member state. Spanning the majority of the Iberian Peninsula, its territory also includes the Canary Islands, in the Eastern Atlantic Ocean; the Balearic Islands, in the Western Mediterranean Sea; and the autonomous cities of Ceuta and Melilla, in mainland Africa. Peninsular Spain is bordered to the north by France, Andorra, and the Bay of Biscay; to the east and south by the Mediterranean Sea and Gibraltar; and to the west by Portugal and the Atlantic Ocean. Spain's capital and largest city is Madrid; other major urban areas include Barcelona, Valencia, Seville, Zaragoza, Málaga, Murcia, and Palma de Mallorca.

In early antiquity, the Iberian Peninsula was inhabited by Celts, Iberians, and other pre-Roman peoples. The Roman conquest of the Iberian peninsula created the province of Hispania, which became deeply Romanised and later Christianised. After the fall of the Western Roman Empire, the peninsula was conquered by tribes from Central Europe, among them the Visigoths, who established the Visigothic Kingdom centred on Toledo. In the early 8th century, most of the peninsula was conquered by the Umayyad Caliphate, with Al-Andalus centred on Córdoba. The northern Christian kingdoms of Iberia launched the so-called Reconquista, gradually repelling and ultimately expelling Islamic rule from the peninsula, culminating with the fall of the Nasrid Kingdom of Granada. The dynastic union of the Crown of Castile and the Crown of Aragon in 1479 under the Catholic Monarchs is often seen as the de facto unification of Spain as a nation state.

Gibraltar (/dʒɪˈbrɔːltər/ jih-BRAWL-tər, Spanish: [xiβɾalˈtaɾ]) is a British Overseas Territory and city located at the southern tip of the Iberian Peninsula, on the Bay of Gibraltar, near the exit of the Mediterranean Sea into the Atlantic Ocean (Strait of Gibraltar). It has an area of 6.8 km (2.6 sq mi) and is bordered to the north by Spain (Campo de Gibraltar). The landscape is dominated by the Rock of Gibraltar, at the foot of which is a densely populated town area. Gibraltar is home to around 34,000 people, primarily Gibraltarians.

Gibraltar was founded as a permanent watchtower by the Almohads in 1160. It switched control between the Nasrids, Castilians and Marinids in the Late Middle Ages, acquiring larger strategic clout upon the destruction of nearby Algeciras c. 1375. It became again part of the Crown of Castile in 1462. In 1704, Anglo-Dutch forces captured Gibraltar from Spain during the War of the Spanish Succession, and it was ceded to Great Britain in perpetuity under the Treaty of Utrecht in 1713. It became an important base for the Royal Navy, particularly during the Napoleonic Wars and World War II, as it controlled the narrow entrance and exit to the Mediterranean Sea, the Strait of Gibraltar, with half the world's seaborne trade passing through it.

Barbados is an island country in the Caribbean located in the Atlantic Ocean. It is part of the Lesser Antilles of the West Indies and the easternmost island of the Caribbean region. It lies on the boundary of the South American and Caribbean plates. Its capital and largest city is Bridgetown.

Inhabited by Kalinago people since the 13th century, and prior to that by other Indigenous peoples, Barbados was claimed for the Crown of Castile by Spanish navigators in the late 15th century. It first appeared on a Spanish map in 1511. The Portuguese Empire claimed the island between 1532 and 1536, but abandoned it in 1620 with their only remnants being the introduction of wild boars intended as a supply of meat whenever the island was visited. An English ship, the Olive Blossom, arrived in Barbados on 14 May 1625; its men took possession of the island in the name of King James I. In 1627, the first permanent settlers arrived from England, and Barbados became an English and later British colony. During this period, the colony operated on a plantation economy, relying initially on the labour of Irish indentured servants and subsequently African slaves who worked on the island's plantations. Slavery continued until it was phased out through most of the British Empire by the Slavery Abolition Act 1833.

The Kingdom of Sicily (Latin: Regnum Siciliae; Sicilian: Regnu di Sicilia; Italian: Regno di Sicilia) was a state that existed in Sicily and the southern Italian Peninsula as well as, for a time, in Northern Africa, from its founding by Roger II of Sicily in 1130 until 1816. It was a successor state of the County of Sicily, which had been founded in 1071 during the Norman conquest of the southern peninsula. The island was divided into three regions: Val di Mazara, Val Demone and Val di Noto.

After a brief rule by Charles of Anjou, a revolt in 1282 known as the Sicilian Vespers threw off Angevin rule in the island of Sicily. The Angevins managed to maintain control in the mainland part of the kingdom, which became a separate entity also styled Kingdom of Sicily, although it is retroactively referred to as the Kingdom of Naples. The Kingdom of Sicily on the island(also known as Kingdom of Trinacria between 1282 and 1442) on the other hand, remained an independent kingdom ruled by relatives of the House of Barcelona, and was then added permanently to the Crown of Aragon as a result of the Compromise of Caspe of 1412. Following the dynastic union of the crowns of Castile and Aragon in 1479, it was a viceroyalty of the Spanish kingdom. During the War of the Spanish Succession (1700–1714), the island was taken over by the House of Savoy. In 1720, Savoy gave it to Austria in exchange for Sardinia. Later, the island was ruled by a branch of the Bourbons. Following the Napoleonic period, the Kingdom of Sicily was formally merged with the Kingdom of Naples to form the Kingdom of the Two Sicilies, which in 1861 became part of the new unified Kingdom of Italy.

Charles V (24 February 1500 – 21 September 1558) was Holy Roman Emperor and Archduke of Austria from 1519 to 1556, King of Spain (as Charles I) from 1516 to 1556, King of Sicily and Naples from 1516 to 1554, and also Lord of the Netherlands and titular Duke of Burgundy (as Charles II) from 1506 to 1555. He was heir to and then head of the rising House of Habsburg. His dominions in Europe included the Holy Roman Empire, extending from Germany to northern Italy with rule over the Austrian hereditary lands and Burgundian Low Countries, and Spain with its possessions of the southern Italian kingdoms of Sicily, Naples, and Sardinia. In the Americas, he oversaw the continuation of Spanish colonization and a short-lived German colonization. The personal union of the European and American territories he ruled was the first collection of realms labelled "the empire on which the sun never sets".

Charles was born in Flanders to Habsburg Archduke Philip the Handsome, son of Maximilian I, Holy Roman Emperor and Mary of Burgundy, and Joanna of Castile, younger child of Isabella I of Castile and Ferdinand II of Aragon, the Catholic Monarchs of Spain. Heir of his grandparents, Charles inherited his family dominions at a young age. After his father's death in 1506, he inherited the Habsburg Netherlands in the Low Countries. In 1516 he became King of Spain as co-monarch of Castile and Aragon with his mother. Spain's possessions included the Castilian colonies of the West Indies and the Spanish Main, as well as Naples, Sicily, and Sardinia. At the death of his grandfather Maximilian in 1519, he inherited the Austrian hereditary lands and was elected as Holy Roman Emperor. He adopted the Imperial name of Charles V as his main title, and styled himself as a new Charlemagne.

The Spanish colonization of the Americas began in 1493 on the Caribbean island of Hispaniola (now Haiti and the Dominican Republic) after the initial 1492 voyage of Genoese mariner Christopher Columbus under license from Queen Isabella I of Castile. These overseas territories of the Spanish Empire were under the jurisdiction of Crown of Castile until the last territory was lost in 1898. Spaniards saw the dense populations of Indigenous peoples as an important economic resource and the territory claimed as potentially producing great wealth for individual Spaniards and the crown. Religion played an important role in the Spanish conquest and incorporation of indigenous peoples, bringing them into the Catholic Church peacefully or by force. The crown created civil and religious structures to administer the vast territory. Spanish men and women settled in greatest numbers where there were dense indigenous populations and the existence of valuable resources for extraction.

The Spanish Empire claimed jurisdiction over the New World in the Caribbean and North and South America, with the exception of Brazil, ceded to Portugal by the Treaty of Tordesillas. Other European powers, including England, France, and the Dutch Republic, took possession of territories initially claimed by Spain. Although the overseas territories under the jurisdiction of the Spanish crown are now commonly called "colonies" the term was not used until the second half of 18th century. The process of Spanish settlement, now called "colonization" and the "colonial era" are terms contested by scholars of Latin America and more generally.

The Kingdom of Castile (/kæˈstiːl/; Spanish: Reino de Castilla: Latin: Regnum Castellae) was a polity in the Iberian Peninsula during the Middle Ages. It traces its origins to the 9th-century County of Castile (Spanish: Condado de Castilla, Latin: Comitatus Castellae), as an eastern frontier lordship of the Kingdom of León. During the 10th century, the Castilian counts increased their autonomy, but it was not until 1065 that it was separated from the Kingdom of León and became a kingdom in its own right. Between 1072 and 1157, it was again united with León, and after 1230, the union became permanent.

Throughout that period, the Castilian kings made extensive conquests in southern Iberia at the expense of the Islamic principalities. The Kingdoms of Castile and of León, with their southern acquisitions, came to be known collectively as the Crown of Castile, a term that also came to encompass overseas expansion.

The Dominican Republic is a country in the Caribbean located on the island of Hispaniola in the Greater Antilles of the Caribbean Sea in the North Atlantic Ocean. It shares a maritime border with Puerto Rico to the east and a land border with Haiti to the west, occupying the eastern five-eighths of Hispaniola which, along with Saint Martin, is one of only two islands in the Caribbean shared by two sovereign states. In the Antilles, the country is the second-largest nation by area after Cuba at 48,671 square kilometers (18,792 sq mi) and second-largest by population after Haiti with approximately 11.4 million people in 2024, of whom 3.6 million reside in the metropolitan area of Santo Domingo, the capital city.

The native Taíno people had inhabited Hispaniola prior to European contact, dividing it into five chiefdoms. Christopher Columbus claimed the island for Castile, landing there on his first voyage in 1492. The colony of Santo Domingo became the site of the first permanent European settlement in the Americas. In 1697, Spain recognized French dominion over the western third of the island, which became the independent First Empire of Haiti in 1804. A group of Dominicans deposed the Spanish governor and declared independence from Spain in November 1821, but were annexed by Haiti in February 1822. Independence came 22 years later in 1844, after victory in the Dominican War of Independence. The next 72 years saw several civil wars, failed invasions by Haiti, and a brief return to Spanish colonial status, before permanently ousting the Spanish during the Dominican Restoration War of 1863–1865. From 1930, the dictatorship of Rafael Trujillo ruled until his assassination in 1961. Juan Bosch was elected president in 1962 but was deposed in a military coup in 1963. The Dominican Civil War of 1965 preceded the authoritarian rule of Joaquín Balaguer (1966–1978 and 1986–1996). Since 1978, the Dominican Republic has moved towards representative democracy.

Population figures for the Indigenous peoples of the Americas before European colonization have been difficult to establish. Estimates have varied widely from as low as 8 million to as many as 100 million, though by the end of the 20th Century, many scholars gravitated toward an estimate of around 50 million people.

The monarchs of the nascent Spanish Empire decided to fund Christopher Columbus' voyage in 1492, leading to the establishment of colonies and marking the beginning of the migration of millions of Europeans and Africans to the Americas. While the population of European settlers, primarily from Spain, Portugal, France, England, and the Netherlands, along with African slaves, grew steadily, the Indigenous population plummeted. There are numerous reasons for the population decline, including exposure to Eurasian diseases such as influenza, pneumonic plagues, and smallpox; direct violence by settlers and their allies through war and forced removal; and the general disruption of societies. Scholarly disputes remain over the degree to which each factor contributed or should be emphasized; some modern scholars have categorized it as a genocide, claiming that deliberate, systematic actions by Europeans were the primary cause. Traditional interpretation of the decline by scholars have disputed this characterization, maintaining that incidental disease exposure was the primary cause. This is supported by evidence where 50-80 percent of the population died from waves of diseases caused by Europeans in places such as Mexico in the 16th century.

The Marinid dynasty (Arabic: المرينيون al-marīniyyūn) was a Berber Muslim dynasty that controlled present-day Morocco from the mid-13th to the 15th century and intermittently controlled other parts of North Africa (Algeria and Tunisia) and of the southern Iberian Peninsula (Spain) around Gibraltar. It was named after the Banu Marin (Arabic: بنو مرين, Berber: Ayt Mrin), a Zenata Berber tribe. It ruled the Marinid sultanate, founded by Abd al-Haqq I.

In 1244, after being at their service for several years, the Marinids overthrew the Almohads which had controlled Morocco. At the height of their power in the mid-14th century, during the reigns of Abu al-Hasan and his son Abu Inan, the Marinid dynasty briefly held sway over most of the Maghreb including large parts of modern-day Algeria and Tunisia. The Marinids supported the Emirate of Granada in al-Andalus in the 13th and 14th centuries and made an attempt to gain a direct foothold on the European side of the Strait of Gibraltar. They were however defeated at the Battle of Río Salado in 1340 and finished after the Castilians took Algeciras from the Marinids in 1344, definitively expelling them from the Iberian Peninsula. Starting in the early 15th century the Wattasid dynasty, a related ruling house, competed with the Marinid dynasty for control of the state and became de facto rulers between 1420 and 1459 while officially acting as regents or viziers. In 1465 the last Marinid sultan, Abd al-Haqq II, was finally overthrown and killed by a revolt in Fez, which led to the establishment of direct Wattasid rule over most of Morocco.

Córdoba (/ˈkɔːrdəbə/ KOR-də-bə; Spanish: [ˈkoɾðoβa] ), or sometimes Cordova (/ˈkɔːrdəvə/ KOR-də-və), is a city in Andalusia, Spain, and the capital of the province of Córdoba. With a population of 324,902 as of 2024, it is the 12th-largest city in Spain and the 3rd-largest in Andalusia.

The city primarily lies on the right bank of the Guadalquivir in the south of the Iberian Peninsula. Once a Roman colony, it was taken over by the Visigothic Kingdom in the sixth century and then conquered by the Muslims in the eighth century. Córdoba became the capital of the Emirate and then Caliphate of Córdoba, from which the Umayyad dynasty ruled al-Andalus. Under Umayyad rule, Córdoba was transformed into a centre of education and learning, and by the 10th century it had grown to be the second-largest city in Europe. The caliphate experienced a manifold political crisis in the early 11th century that brought about state collapse. Following the Christian conquest in 1236, Córdoba became part of the Crown of Castile as the head of the Kingdom of Córdoba.

Madrid is the capital and most populous municipality of Spain. Madrid has almost 3.3 million inhabitants and a metropolitan area population of approximately 6.8 million. It is the second-largest city in the European Union (EU), and its metropolitan area is the second-largest in the EU. The municipality covers 604.3 km (233.3 sq mi) geographical area. Madrid lies on the River Manzanares in the central part of the Iberian Peninsula at about 650 m (2,130 ft) above mean sea level. The capital city of both Spain and the surrounding autonomous community of Madrid, it is the political, economic, and cultural centre of the country.

The primitive core of Madrid, a walled military outpost, dates back to the late 9th century, under the Emirate of Córdoba. Conquered by Christians in 1083 or 1085, it consolidated in the Late Middle Ages as a sizeable town of the Crown of Castile. The development of Madrid as an administrative centre was fostered after 1561, as it became the permanent seat of the court of the Hispanic Monarchy. The following centuries were characterised by the reinforcement of Madrid's status within the framework of a centralised form of state-building.

Barcelona (/ˌbɑːrsəˈloʊnə/ BAR-sə-LOH-nə; Catalan: [bəɾsəˈlonə] ; Spanish: [baɾθeˈlona] ) is a city on the northeastern coast of Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second-most populous municipality of Spain. With a population of 1.7 million within city limits, its urban area extends to numerous neighbouring municipalities within the province of Barcelona and is home to around 5.7 million people, making it the fifth most populous urban area of the European Union after Paris, the Ruhr area, Madrid and Milan. It is one of the largest metropolises on the Mediterranean Sea, located on the coast between the mouths of the rivers Llobregat and Besòs, bounded to the west by the Serra de Collserola mountain range.

According to tradition, Barcelona was founded by either the Phoenicians or the Carthaginians, who had trading posts along the Catalonian coast. In the Middle Ages, Barcelona became the capital of the County of Barcelona. After joining with the Kingdom of Aragon to form the composite monarchy of the Crown of Aragon, Barcelona, which continued to be the capital of the Principality of Catalonia, became the most important city in the Crown of Aragon and its main economic and administrative centre, only to be overtaken by Valencia, wrested from Moorish control by the Catalans, shortly before the dynastic union between the Crown of Castile and the Crown of Aragon in 1516. Barcelona became the centre of Catalan separatism, briefly becoming part of France during the 17th century Reapers' War and again in 1812 until 1814 under Napoleon. Experiencing industrialization and several workers movements during the 19th and early 20th century, it became the capital of autonomous Catalonia in 1931 and it was the epicenter of the revolution experienced by Catalonia during the Spanish Revolution of 1936, until its capture by the fascists in 1939. After the Spanish transition to democracy in the 1970s, Barcelona once again became the capital of an autonomous Catalonia.

Málaga (/ˈmæləɡə/ ; Spanish: [ˈmalaɣa] ) is a municipality and resort city of Spain, capital of the Province of Málaga, in the autonomous community of Andalusia. With a population of 592,346 in 2024, it is the 2nd-largest city in Andalusia and the 6th-largest in the country. It lies in Southern Iberia on the Costa del Sol ('Coast of the Sun') of the Mediterranean, primarily on the left bank of the Guadalhorce. The urban core originally developed in the space between the Gibralfaro Hill and the Guadalmedina.

Málaga's history spans about 2,800 years, making it one of the oldest continuously inhabited cities in Western Europe. According to most scholars, it was founded about 770 BC by the Phoenicians from Tyre as Malaka. From the 6th century BC the city was under the hegemony of Ancient Carthage, and from 218 BC, it was under Roman rule, economically prospering owing to garum production. In the 8th century, after a period of Visigothic and Byzantine rule, it was placed under Islamic rule. In 1487, the Crown of Castile gained control in the midst of the Granada War. In the 19th century, the city underwent a period of industrialisation followed by a decay in all socioeconomic parametres in the last third of the century.

The Catholic Monarchs were Queen Isabella I of Castile (r. 1474–1504) and King Ferdinand II of Aragon (r. 1479–1516), whose marriage and joint rule marked the de facto unification of Spain. They were both from the House of Trastámara and were second cousins, as they were both descended from John I of Castile. To remove the obstacle that this consanguinity would otherwise have posed to their marriage under canon law, they were given a papal dispensation by Sixtus IV. They married on October 19, 1469, in the city of Valladolid; Isabella was 18 years old and Ferdinand a year younger. Most scholars generally accept that the unification of Spain can essentially be traced back to the marriage of Ferdinand and Isabella. Their reign was called by W.H. Prescott "the most glorious epoch in the annals of Spain."

Spain was formed as a dynastic union of two crowns rather than a unitary state, as Castile and Aragon remained separate kingdoms until the Nueva Planta decrees of 1707–1716. The court of Ferdinand and Isabella was constantly on the move in order to bolster local support for the crown from local feudal lords. The title of "Catholic King and Queen" was officially bestowed on Ferdinand and Isabella by Pope Alexander VI in 1494, in recognition of their defence of the Catholic faith within their realms.

The Battle of the Strait (Spanish: Batalla del Estrecho) was a military conflict contesting the ports in the Straits of Gibraltar taking place in the late thirteenth century and the first half of the fourteenth. The conflict involves principally the Spanish Muslim Emirate of Granada, the Spanish Christian Crown of Castile and the North African Muslim Marinid state. The ports' strategic value came from their position linking Spain and North Africa, thus connecting Muslims in Spain with the rest of the Islamic world. The campaign had mixed results. Castile gained Tarifa permanently, and managed to take Gibraltar and Algeciras but both would revert to Muslim rule. Castile also failed to gain any port in the African side of the strait.

The Hispanic Monarchy (Monarquía Hispánica in Spanish), also known as the Catholic Monarchy and historically referred to as the Monarchy of Spain, was the political entity encompassing the territories and dependencies of the Spanish Empire between 1479 and 1716. These regions maintained distinct, individual public institutions, councils, and legal systems, but were united under the control of a superior entity (the King of Spain) and common state institutional structures. This monarchy was administered under a polysynodial system of councils. The Spanish monarch acted as king (or with the corresponding title) according to the political constitution of each kingdom, state, or lordship, and thus, their formal power varied from one territory to another. However, they acted as a unified monarch over all the territories of the monarchy, almost like a Composite Monarchy.

The Monarchy included the Crown of Castile—with Granada, Navarre and the kingdoms of the Indies—and Aragon—with Sicily, Naples, Sardinia, Malta and the State of the Presidi—, Portugal and its overseas territories between 1580 and 1640, the territories of the Burgundian Circle except between 1598–1621—Franche-Comté, the Netherlands, as well as Charolais—, the Duchy of Milan, the Marquisate of Finale, the Spanish East Indies, and Spanish Africa.

Algeciras (Spanish: [alxeˈθiɾas] ) is a city and a municipality of Spain belonging to the province of Cádiz, Andalusia. With a registered population as of 2020 of 123,078, it’s the largest municipality of the Campo de Gibraltar and the second largest in the province. The city is located in the western shore of the Bay of Gibraltar (Bahía de Algeciras) opposite the Rock of Gibraltar, around the mouth of the Río de la Miel, now mostly culverted in its lower course near the southernmost end of the Iberian Peninsula and continental Europe and the Strait of Gibraltar.

The area was inhabited in Antiquity, including archaeological strata generally identified with the Roman city of Iulia Traducta. Founded soon after the Islamic conquest of the Iberian Peninsula on the mouth of the Río de la Miel, al-Jazira al-Khadrā [es] became the head of a rump taifa kingdom after Umayyad state collapse in the 11th century. In 1275, the Emirate of Granada ceded the place to the Marinids, who founded the new walled precinct of al-Bunayya after 1282 on the opposite bank of the Río de la Miel. The twin medinas were conquered in 1344 by the Crown of Castile. Medieval urban continuity came to an abrupt end when the town was torn down by the Nasrids circa 1369–1385. The ruins were repopulated and the town eventually refounded upon the arrival of refugees from the 1704 Anglo-Dutch capture of Gibraltar.