Battle of São Mamede
24 June 1128
The Battle of São Mamede (Portuguese: Batalha de São Mamede) took place on 24 June 1128 near Guimarães and is considered an important event in the process that led to the establishment of Portugal as an independent kingdom. Forces led by Afonso Henriques defeated forces led by his mother, Theresa of Portugal, and Fernão Peres de Trava.