King of Aragon in the context of "Fuero"

The Kingdom of Aragon (Aragonese: Reino d'Aragón; Catalan: Regne d'Aragó; Latin: Regnum Aragoniae; Spanish: Reino de Aragón) was a medieval and early modern kingdom on the Iberian Peninsula, corresponding to the modern-day autonomous community of Aragon, in Spain. It became a part of the larger Crown of Aragon, which also included other territories—the Principality of Catalonia (which included the former Catalan Counties), the Kingdom of Valencia, the Kingdom of Majorca, and other possessions that are now part of France, Italy, and Greece—that were also under the rule of the King of Aragon, but were administered separately from the Kingdom of Aragon.

In 1479, upon John II of Aragon's death, the crowns of Aragon and Castile were united to form the nucleus of modern Spain. The Aragonese lands retained autonomous parliamentary and administrative institutions, such as the Corts. The arrangement remained until the Nueva Planta decrees, promulgated between 1707 and 1715 by Philip V of Spain in the aftermath of the War of the Spanish Succession, centralised power in Spain. However, the title "King of Aragon" would continue to be used by the centralised Spanish crown.

Ferdinand II, also known as Ferdinand I, Ferdinand III, and Ferdinand V (10 March 1452 – 23 January 1516), called Ferdinand the Catholic, was King of Aragon from 1479 until his death in 1516. As the husband and co-ruler of Queen Isabella I of Castile, he was also King of Castile from 1475 to 1504 (as Ferdinand V). He reigned jointly with Isabella over a dynastically unified Spain; together they are known as the Catholic Monarchs. Ferdinand is considered the de facto first king of Spain, and was described as such during his reign, even though, legally, Castile and Aragon remained two separate kingdoms until they were formally united by the Nueva Planta decrees issued between 1707 and 1716.

The Crown of Aragon that Ferdinand inherited in 1479 included the kingdoms of Aragon, Valencia, Mallorca, Sardinia, and Sicily, as well as the Principality of Catalonia. His marriage to Isabella is regarded as the "cornerstone in the foundation of the Spanish monarchy". They played a major role in the European colonization of the Americas, sponsoring the first voyage of Christopher Columbus in 1492. That year the couple defeated Granada, the last Muslim state in Western Europe, thus completing the centuries-long Reconquista.

Alfonso the Magnanimous (Alfons el Magnànim in Catalan) (1396 – 27 June 1458) was King of Aragon and King of Sicily (as Alfons V) and the ruler of the Crown of Aragon from 1416 and King of Naples (as Alfons I) from 1442 until his death. He was involved with struggles to the throne of the Kingdom of Naples with Louis III of Anjou, Joanna II of Naples and their supporters, but ultimately failed and lost Naples in 1424. He recaptured it in 1442 and was crowned king of Naples. He had good relations with his vassal, Stjepan Kosača, and his ally, Skanderbeg, providing assistance in their struggles in the Balkans. He led diplomatic contacts with the Ethiopian Empire and was a prominent political figure of the early Renaissance, being a supporter of literature as well as commissioning several constructions for the Castel Nuovo.
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A composite monarchy (or composite state) is a historical category that describes early modern states consisting of several countries under one ruler, sometimes designated as a personal union, who governs his territories as if they were separate kingdoms, in accordance with local traditions and legal structures. The composite state became the most common type of state in the late medieval and early modern era in Europe. Koenigsberger divides composite states into two classes: those, like the Spanish Empire, that consisted of countries separated by either other states or by the sea, and those, like Poland–Lithuania, that were contiguous. The term was introduced by H. G. Koenigsberger in 1975 and popularised by Sir John H. Elliott in 1992.

A medieval example of a composite monarchy was the Angevin Empire. Theorists of the 16th century believed that "conformity" (similarity in language and customs) was important to success of a composite state. Francesco Guicciardini praised the acquisition of the Kingdom of Navarre by the King of Aragon in 1512 on account of their conformità. Yet, differences could be persistent. Navarre retained its own law and customs separate from the rest of Spain down to 1841. In France, a far more unified state than Spain in the early modern period, the state was divided into different customary tax regimes, the pays d'élection and pays d'état. This was abolished during the 1789 Revolution. The Holy Roman Empire consisted of hundreds of imperial immediate states nicknamed Kleinstaaterei. Most sovereign kings in Europe hold fiefs in the HRE in a personal union at some point. The different holdings of a dynasty are called Hausmacht and were in most cases not contiguous.

Peter III of Aragon (In Aragonese, Pero; in Catalan, Pere; in Italian, Pietro; c. 1239 – 11 November 1285) was King of Aragon, King of Valencia (as Peter I), and Count of Barcelona (as Peter II) from 1276 to his death. At the invitation of some rebels, he conquered the Kingdom of Sicily and became King of Sicily (as Peter I) in 1282, pressing the claim of his wife, Constance II of Sicily, uniting the kingdom to the crown.

John II (Spanish: Juan II, Catalan: Joan II, Aragonese: Chuan II and Basque: Joanes II; 29 June 1398 – 20 January 1479), called the Great (el Gran) or the Faithless (el Sense Fe), was King of Aragon from 1458 until his death in 1479. As the husband of Queen Blanche I of Navarre, he was King of Navarre from 1425 to 1479. John was also King of Sicily from 1458 to 1468.

James I the Conqueror (Catalan: Jaume I or Jaume el Conqueridor; Aragonese: Chaime I o Conqueridor; 2 February 1208 – 27 July 1276) was King of Aragon, Count of Barcelona, and Lord of Montpellier from 1213 to 1276; King of Majorca from 1231 to 1276; and King of Valencia from 1238 to 1276. His long reign of 62 years is not only the longest of any Iberian monarch, but one of the longest monarchical reigns in history, ahead of Hirohito but remaining behind Queen Elizabeth II, Queen Victoria, and Ferdinand I of the Two Sicilies and King Louis XIV

King James I saw the expansion of the Crown of Aragon in three directions: Languedoc to the north, the Balearic Islands to the southeast, and Valencia to the south. By a treaty with Louis IX of France, he achieved the renunciation of any possible claim of French suzerainty over the County of Barcelona and the other Catalan counties, while he renounced northward expansion and taking back the once Catalan territories in Occitania and vassal counties loyal to the County of Barcelona, lands that were lost by his father Peter II of Aragon in the Battle of Muret during the Albigensian Crusade and annexed by the Kingdom of France, and then decided to turn south. His great part in the Reconquista was similar in Mediterranean Spain to that of his contemporary Ferdinand III of Castile in Andalusia. One of the main reasons for this formal renunciation of most of the once Catalan territories in Languedoc and Occitania, and any expansion into them, is that he was raised by the Knights Templar Crusaders, who had defeated his father, who was fighting for the Pope alongside the French. It was thus effectively forbidden for him to try to maintain the traditional influence of the Count of Barcelona that previously existed in Occitania and Languedoc.

Martin the Humane (29 July 1356 – 31 May 1410), also called the Elder and the Ecclesiastic, was King of Aragon, Valencia, Sardinia and Corsica and Count of Barcelona from 1396 and King of Sicily from 1409 (as Martin II). He failed to secure the accession of his illegitimate grandson, Frederic, Count of Luna, and with him the rule of the House of Barcelona came to an end.