Afonso III, King of Portugal, the Bolognian (Port.

o Bolonhês), (May 5, 1210 in Coimbra – February 16, 1279 in Alcobaça, Coimbra or Lisbon) is the first to use the title King of Portugal and the Algarve, from 1249.

He is the second son of King Afonso II of Portugal and his wife, Urraca of Castile; he succeeds his brother, King Sancho II of Portugal, who is removed from the throne on January 4, 1248.