Joanna II of Naples in the context of René of Anjou

The Kingdom of Naples, officially the Kingdom of Sicily, was a state that ruled the part of the Italian Peninsula south of the Papal States between 1282 and 1816. It was established by the War of the Sicilian Vespers (1282–1302). Until then, the island of Sicily and southern Italy had constituted the "Kingdom of Sicily". When the island of Sicily revolted and was conquered by the Crown of Aragon, it become a separate kingdom also called the Kingdom of Sicily. This left the Neapolitan mainland in the possession of Charles of Anjou who continued to use the name "Kingdom of Sicily". Later, two competing lines of the Angevin family competed for the Kingdom of Naples in the late 14th century, which resulted in the murder of Joanna I at the hands of her successor, Charles III of Naples. Charles' daughter Joanna II adopted King Alfonso V of Aragon as heir, who would then unite Naples into his Aragonese dominions in 1442.

As part of the Italian Wars, France briefly ruled the territory in 1494 and at the beginning of the 16th century; it then went to war with Spain over the kingdom in 1502, a conflict that ended in a victory for Ferdinand II, who was in full control of the kingdom by 1504. The Spanish held control of Naples throughout the 17th century where it remained an important source of economic and military power for the Spanish Crown. After the War of the Spanish Succession in the early 18th century, the possession of the kingdom again changed hands; the 1714 Treaty of Rastatt saw Naples given to Charles VI of the Austrian Habsburgs. However, Naples and Sicily were conquered by Charles, Duke of Parma (of the Spanish Bourbons) during the War of the Polish Succession in 1734, he was then installed as King of Naples and Sicily from 1735. In 1816, Naples formally unified with the island of Sicily to form the Kingdom of the Two Sicilies.

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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James II of Bourbon-La Marche (1370 – 1438 in Besançon) was count of La Marche. He was captured at the battle of Nicopolis in 1396, later being ransomed. In 1403, James led an attack on English soil and burned Plymouth. He married Queen Joanna II of Naples in 1415, and was largely unpopular being imprisoned then forced to leave the kingdom of Naples in 1419. James relinquished his titles and became a monk in 1435. He died in 1438.