Alfonso IV, king of Aragón and count of Barcelona

Alfonso IV, 1299–1336, king of Aragón and count of Barcelona (1327–36), son and successor of James II. Before his accession he conquered (1323–24) Sardinia Sardinia (särdĭn`ēə), Ital. Sardegna, region (1991 pop.
..... Click the link for more information. , where later a revolt involved him in war with Genoa and Pisa. He was succeeded by his son, Peter IV.

Alfonso IV, king of Portugal

Alfonso IV, 1291–1357, king of Portugal (1325–57), son and successor of Diniz Diniz, Port. Dinis (dēnēsh`), 1261–1325, king of Portugal (1279–1325), son and successor of Alfonso III.
..... Click the link for more information. . Disgruntled by the favoritism his father showed toward Alfonso's illegitimate half brothers, Alfonso rose in revolt in 1320. Although peace was arranged twice by his mother, St. Elizabeth (or St. Isabel) of Portugal, he was estranged from Diniz most of the five years before his father's death. He was involved (1337–40) in a fruitless war with Alfonso XI of Castile before joining him in a campaign against the Moors that culminated in the notable victory of Tarifa (Oct., 1340). Alfonso is, however, best remembered for countenancing the murder (1355) of his son's mistress (or wife), Inés de Castro Castro, Inés de, or Inez de Castro (both: ī`nĕz də kăs`trō, Port.
..... Click the link for more information. , one of the most romantic figures in Portuguese history. His son (later Peter I Peter I, 1320–67, king of Portugal (1357–67), son and successor of Alfonso IV. He married (1336) Constance Manuel, a Castilian noblewoman, but subsequently fell in love with one of her ladies in waiting, Inés de Castro .
..... Click the link for more information. ) promptly led a rebellion, but peace between father and son was restored before Alfonso's death.