Battle of São Mamede

Battle of São Mamede
Part of the Reconquista

The first Portuguese afternoon (1922) by Acácio Lino
Date24 June 1128
Location
Result
  • County of Portugal achieves de facto independence
  • Theresa and Fernando Pérez de Traba leave the government of the county
Belligerents
County of Portugal Kingdom of Galicia
Commanders and leaders
Afonso Henriques

The Battle of São Mamede took place on 24 June 1128 near Guimarães and is considered the seminal event for the foundation of the Kingdom of Portugal and the battle that ensured Portugal's independence. Portuguese forces led by Afonso Henriques defeated forces led by his mother Teresa of Portugal and her lover Fernão Peres de Trava. Following São Mamede, the future king styled himself "Prince of Portugal". He would be called "King of Portugal" starting in 1139 and was recognised as such by neighbouring kingdoms in 1143.