Alfonso IV of Portugal
| Afonso IV | |
|---|---|
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| King of Portugal and the Algarve | |
| Reign | 7 January 1325 – 28 May 1357 |
| Predecessor | Denis |
| Successor | Peter I |
| Born | 8 February 1291 Lisbon, Kingdom of Portugal |
| Died | 28 May 1357 (aged 66) Lisbon, Kingdom of Portugal |
| Burial | Lisbon Cathedral, Portugal |
| Consort | Beatrice of Castile |
| Issue | See descendants |
| House | House of Burgundy |
| Father | Denis of Portugal |
| Mother | Elizabeth of Aragon |
| Religion | Roman Catholicism |
Afonso IV (Portuguese pronunciation: [ɐˈfõsu]; 8 February 1291 – 28 May 1357), called the Brave (Portuguese: o Bravo), was King of Portugal and the Algarves from 1325 until his death. He was the only legitimate son of King Denis of Portugal by his wife Elizabeth of Aragon.
Afonso, born in Lisbon, was the rightful heir to the Portuguese throne. However, he was not Denis' favourite son, the old king preferring his illegitimate son, Afonso Sanches. The notorious rivalry between the half brothers led to civil war several times. On 7 January 1325, Afonso's father died and he became king, whereupon he exiled his rival to Castile, and stripped him of all the lands and fiefdom given by their father. From Castile, Afonso 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's mother Queen Elizabeth.
In 1309, Afonso IV married Infanta Beatrice of Castile, daughter of King Sancho IV of Castile by his wife María de Molina. The first-born of this union was Infanta Maria of Portugal.
In 1325 Alfonso XI of Castile entered a child-marriage with Constanza Manuel of Castile, the daughter of one of his regents. Two years later, he had the marriage annulled so he could marry Afonso's daughter, Maria of Portugal. Maria became Queen of Castile in 1328 upon her marriage to Alfonso XI, who soon became involved publicly with a mistress. Constanza was imprisoned in a castle in Toro while her father, Juan Manuel, Prince of Villena, waged war against Alfonso XI until 1329. Eventually, the two reached a peaceful accord after mediation by Juan del Campo, Bishop of Oviedo; this secured Constance's release from prison.
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