James IV of Majorca, also known as Jaume IV (c. 1336 – 20 January 1375), unsuccessfully claimed the thrones of the Kingdom of Majorca and the Principality of Achaea from 1349 until his death. He was also king consort of Naples, without any role in its government. Early life Born around 1336, James was the son of King James III of Majorca and Constance of Aragon. The Kingdom of Majorca came into being when James the Conqueror, King of Aragon, died on 27 June 1276. He distributed his realms between his two sons, leaving his elder son, Peter III, with Aragon, Catalonia and Valencia, and his younger son, James II, with the Balearic Islands, Montpellier, Roussillon and Cerdanya. Peter III of Aragon and his successors made several attempts to re-unite the lands of the Crown of Aragon under their rule. Peter III demanded an oath of fealty from his brother in 1280; Peter III's elder son, Alfonso III of Aragon, occupied the Balearic Islands in 1287. Alfonso III's brother and successor, James II of Aragon, restored the islands to his uncle in the Treaty of Anagni in 1295, but James II of Majorca had to acknowledge his nephew's suzerainty. In 1324, James II of Aragon confirmed the right of James II of Mallorca's grandson, James III of Majorca (James IV's father), to inherit the Kingdom of Mallorca after lengthy negotiations. James III married the sister of Peter IV of Aragon, but their relationship was tense, because James III avoided to do homage to his brother-in-law for years. Peter IV declared James III a disobedient vassal and occupied the Balearic Islands, Roussillon and Cerdanya in May 1344.

From Wikipedia (CC BY-SA 4.0).

James IV of Majorca, also known as Jaume IV (c. 1336 – 20 January 1375), unsuccessfully claimed the thrones of the Kingdom of Majorca and the Principality of Achaea from 1349 until his death. He was also king consort of Naples, without any role in its government.