Alfonso IV of Aragon

Alfonso IV the Kind (2 November 1299 – 24 January 1336) was born in Naples, the second son of James II and Blanche of Anjou. In 1314 he married Teresa d'Entença, heiress to the County of Urgell, which thereby joined the Crown lands.

He became heir when his elder brother James renounced the throne in 1319, led the conquest of Sardinia in 1323–1324 and succeeded as king in November 1327. A long war with Genoa began in 1329.

That year he married Eleanor of Castile; his grants of land to their sons divided the court and provoked opposition in Valencia. He died aged 36, leaving the crown to his son Peter IV.