Alfonso IV, called the Kind (also the Gentle or the Nice, Catalan: Alfons el Benigne) (1299 – 24 January 1336) was the King of Aragon and Count of Barcelona (as Alfonso III) from 1327 to his death. He was the second son of James II and Blanche of Anjou. His reign saw the incorporation of the County of Urgell, Duchy of Athens, and Duchy of Neopatria into the Crown of Aragon.
During the reign of his father, he was the procurator general of the Crown. He married Teresa d'Entença, heiress of Urgell, in 1314. In 1323–1324, he undertook the conquest of Sardinia. He became heir after his older brother James renounced his rights to become a monk. In 1329, he began a long war with the Republic of Genoa. The city of Sassari surrenderd in 1323, but rebelled three more times and was contested by Genoa.
After widowing, Alfonso married Eleanor of Castile, who was betrothed to his brother James, who had refused to consummate the marriage. She was the sister of Alfonso XI of Castile.
| Alfonso IV of Aragon | Father: James II of Aragon | Paternal Grandfather: Peter III of Aragon | Paternal Great-grandfather: James I of Aragon |
| Paternal Great-grandmother: Violant of Hungary | |||
| Paternal Grandmother: Constantia of Sicily | Paternal Great-grandfather: Manfred of Sicily | ||
| Paternal Great-grandmother: Beatrice of Savoy | |||
| Mother: Blanche of Anjou | Maternal Grandfather: Charles II of Naples | Maternal Great-grandfather: Charles I of Naples | |
| Maternal Great-grandmother: Beatrice of Provence | |||
| Maternal Grandmother: Maria Arpad of Hungary | Maternal Great-grandfather: Stephen V of Hungary | ||
| Maternal Great-grandmother: Elisabeth of Kuthan |
By Eleanor of Castile: