The subsequent birth of two sons to Alfonso, the future kings Sancho III and Ferdinand II, and the geographic distance between Afonso's Portuguese power base and the Crown's, probably convinced Afonso to rebel in contravention of the Treaty of Tui (1137) and invade Galicia.
Sancho III of Castile (1134–1158), Sancho the Desired, King of Castile and of Toledo
William III of England | George III of the United Kingdom | Henry III of England | George III | Edward III of England | Henry III | Edward III | Castile | Charles III of Spain | William III | Loudon Wainwright III | WTA Tier III tournaments | Richard III of England | Benigno Aquino III | Pope Alexander III | Star Wars Episode III: Revenge of the Sith | Henry III of France | Gustav III of Sweden | Alfonso X of Castile | Shalmaneser III | Alexander III of Russia | Albatros D.III | Kingdom of Castile | Frederick III | Crown of Castile | Rainier III, Prince of Monaco | Otto III | Frederick William III of Prussia | Victor Emmanuel III of Italy | Isabella I of Castile |