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Afonso III, or Affonso, Alfonso or Alphonso (Portuguese-Galician) or Alphonsus (Latin), the Boulonnais, King of Portugal was the first to use the title King of Portugal and the Algarve, from 1249. He was the second son of King Afonso II of Portugal and his wife, Urraca of Castile; he succeeded his brother, King Sancho II of Portugal, who died on 4 January 1248.