House of Barcelona in the context of "Bellonids"

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.

The land of Provence has a history quite separate from that of any of the larger nations of Europe. Its independent existence has its origins in the frontier nature of the dukedom in Merovingian Gaul. In this position, influenced and affected by several different cultures on different sides, the Provençals maintained a unity which was reinforced when the region was made a separate kingdom during the Carolingian decline of the later ninth century. When Boso of Provence acquired the region in 879, it was known as Lower Burgundy until it was merged with Upper Burgundy in 933 to form the Kingdom of Arles. The counts of Arles began calling themselves "count of Provence"; although in name vassals, they were de facto autonomous princes. After 1032, the county was part of the Holy Roman Empire.

In the eleventh century, Provence became disputed between the traditional line and the counts of Toulouse, who claimed the title of "Margrave of Provence". In the High Middle Ages, the title of Count of Provence belonged to local families of Frankish origin, from 1112 to 1245 to the House of Barcelona (a cadet branch of the House of Aragón), from 1245 to 1382 to the House of Anjou, and from 1382 to 1481 to a cadet branch of the House of Valois. It was inherited by King Louis XI of France in 1481, and definitively incorporated into the French royal domain by his son Charles VIII in 1487.

The Kingdom of Trinacria was established after Sicilian Vespers in 1282, when King Peter III of Aragon ascended the throne, and was consolidated after the War of the Sicilian Vespers in 1302. According to the Peace of Caltabellota, the Kingdom of Sicily was officially divided into two parts, one of which was the island part of Sicily, officially called the Kingdom of Trinacria, but informally called the Kingdom of Sicily.

Since then, Sicily island was ruled as an independent kingdom 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. Meanwhile, the continental part of the Kingdom of Sicily, known colloquially as the Kingdom of Naples, remained under the crown of King Charles II of Anjou. The two resulting kingdoms were separated until 1442, when King Alfonso V of Aragon conquered the Kingdom of Naples and unified both Kingdoms.

The War of the Sicilian Vespers, also shortened to the War of the Vespers, was a conflict waged by several medieval European kingdoms over control of Sicily from 1282 to 1302. The war, which started with the revolt of the Sicilian Vespers, was fought over competing dynastic claims to the throne of Sicily and grew to involve the Crown of Aragon, Angevin Kingdom of Naples, Kingdom of France, and the papacy.

Initially fought between Sicilian rebels and Charles of Anjou in Sicily and Southern Italy, the war expanded when Peter of Aragon intervened in Sicily to support the rebels and claim the throne. After Aragonese successes, the war grew into the concurrent Aragonese Crusade as the Kingdom of France intervened against Aragon in Iberia. The crusade ended in defeat, but efforts to end the war failed despite several peace treaties. Aragon gave up the crown of Sicily in exchange for papal concessions in 1297, entering into an alliance with Angevin Naples and the papacy against Sicily, but the new alliance's campaign to invade Sicily saw no success. The war ended in 1302 in the Peace of Caltabellotta, by which Sicily became an independent kingdom ruled by the House of Barcelona.

The County of Barcelona (Latin: Comitatus Barcinonensis, Catalan: Comtat de Barcelona) was a polity in northeastern Iberian Peninsula, originally located in the southern frontier region of the Carolingian Empire. In the 10th century, the Counts of Barcelona progressively achieved independence from Frankish rule, becoming hereditary rulers in constant warfare with the Islamic Caliphate of Córdoba and its successor states. The counts, through marriage, alliances and treaties, acquired or vassalized the other Catalan counties and extended their influence over Occitania. In 1164, the County of Barcelona entered a personal union with the Kingdom of Aragon. Thenceforward, the history of the county is subsumed within that of the Crown of Aragon, but the city of Barcelona remained preeminent within it.

Within the Crown, the County of Barcelona and the other Catalan counties progressively merged into a polity known as the Principality of Catalonia, which assumed the institutional and territorial continuity of the County of Barcelona.

The Peace of Caltabellotta, signed on 31 August 1302, was the last of a series of treaties, including those of Tarascon and Anagni, designed to end the War of the Sicilian Vespers between the Houses of Anjou and Barcelona for ascendancy in the Mediterranean and especially Sicily and the Mezzogiorno.

The peace divided the old Kingdom of Sicily into an island portion and a peninsular portion. The island, called the Kingdom of Trinacria, went to Frederick III, who had been ruling it; the Mezzogiorno, called the Kingdom of Sicily contemporaneously but the Kingdom of Naples by modern scholarship, went to Charles II, who had been ruling it. Thus, the peace was formal recognition of an uneasy status quo.

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.