Seventh king of Portugal, victor over the Marinids at Río Salado, remembered darkly for ordering the killing of Inês de Castro.
Afonso IV, seventh king of Portugal, earned the byname "the Brave" for his military energy, above all his part in the decisive Christian victory over the Marinids and Granadans at the Battle of Río Salado in 1340, which ended the last great Muslim invasion of the Iberian Peninsula from North Africa.
His reign is remembered as much for tragedy and conflict: a war with Castile, the devastation of the Black Death in 1348, and above all his order for the killing of Inês de Castro, the mistress of his son and heir Pedro, in 1355. That act drove Pedro into open revolt and cast a long shadow over the end of an otherwise vigorous reign.
Afonso was born in 1291, the legitimate son and heir of King Denis. His youth was marked by jealousy of his father's illegitimate son Afonso Sanches, whom he believed Denis favoured, and this resentment erupted into civil war against his own father in the 1320s before their reconciliation shortly before Denis's death. He inherited the throne in 1325 already hardened by that conflict.
Afonso IV is remembered as a forceful and combative ruler — his byname "the Brave" (o Bravo) captures both real martial courage and a hard, sometimes harsh temperament. He had fought his own father as a prince, moved against his half-brother, and as king pursued royal authority and justice with vigour, curbing noble excesses and building up the fleet.
The defining stain on his memory is the killing of Inês de Castro. Fearing the political influence of Inês, a Castilian noblewoman, and her family over his heir Pedro, Afonso authorised her execution in 1355. The decision — whether a cold act of statecraft against a feared foreign faction or a father's catastrophic misjudgement — provoked Pedro to rise in arms against him and became one of the most famous tragedies in Portuguese history, fixing Afonso in memory as the king who chose reason of state over his son's love, at ruinous cost.
Afonso's reign opened with a war against Castile, partly over the treatment of his daughter Maria, queen of Castile, before the two Christian kingdoms combined against a common enemy. In 1340 a Marinid army from Morocco allied with Granada threatened to reverse the Reconquista; Afonso IV led a Portuguese force alongside Alfonso XI of Castile to a crushing victory at the Battle of Río Salado, the last major Muslim invasion of Iberia from Africa.
The later years of the reign were darker. The Black Death reached Portugal in 1348 and killed a large part of the population, disrupting labour, landholding, and royal revenue. Against this troubled background came the crisis over Inês de Castro and Pedro's revolt, which was still unresolved at the king's death.
Afonso IV died at Lisbon in 1357 with the kingdom shaken by his heir's rebellion over the killing of Inês de Castro. He was succeeded by that same son, Pedro I, whose reign would be haunted by the memory of Inês and by a reputation for stern personal justice.
Afonso IV left a double memory: the victorious defender of Christian Iberia at Río Salado, and the father who ordered the death of Inês de Castro. His reign combined genuine military and administrative achievement with the demographic catastrophe of the Black Death and a family tragedy that became one of the enduring legends of Portuguese literature and history.