Afonso IV (Afonso Dinis; 8 February 1291 – 28 May 1357), called the Brave (Portuguese: o Bravo), was King of Portugal from 1325 until his death in 1357. He was the only legitimate son of King Denis of Portugal and Elizabeth of Aragon.
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Early life
Afonso, born in Lisbon, was the rightful heir to the Portuguese throne. However, he was not Denis' favourite son, even nearly beginning conflict against him. Instead, the old king preferred his illegitimate son, Afonso Sanches. The notorious rivalry between the half-brothers led to civil war several times. On 7 January 1325, Afonso IV's father died and he became king, whereupon he exiled his rival, Afonso Sanches, to Castile, and stripped him of all the lands and fiefdom given by their father. From Castile, Afonso Sanches orchestrated a series of attempts to usurp the crown. After a few failed attempts at invasion, the brothers signed a peace treaty, arranged by Afonso IV's mother, Elizabeth.
In 1309, Afonso married Beatrice of Castile, daughter of King Sancho IV of Castile and María de Molina. The first-born of this union was a daughter, Maria of Portugal.