John of Aragon
John of Aragon (1330–1358) was an infante of Aragon, the younger son of King Alfonso IV and Eleanor of Castile. After his father's death his half-brother Peter IV seized his inheritance, but restored the lordship of Elche to him in 1338.
In 1354 Peter I of Castile married him to Isabel Díaz de Haro, heiress of Biscay. He served Peter as standard-bearer in the War of the Two Peters, until Peter had him killed at Bilbao in 1358.