Afonso I of Portugal, (1094-1195) (Afonso Henriques)

Alfonso I of Naples, also known as Alfonso V of Aragon

Afonso I Mvemba a Nzinga of Kongo, (1456-1543) the first Christian king of the Kingdom of Kongo and one of the first Black Africans of whom we have written documents in an European language

Alfonso I of Aragon, (1104-1134)

Alphonso I of Ferrara, duke of Ferrara (15th century)

Alfonso I of Asturias, (739-757)

Alfonso I (of Castile), (1040-1109) the first King of Castile to be called Alfonso, but better known as Alfonso VI of Castile as he was the sixth Alfonso in the line that started with Alfonso I of Asturius, and included another monarch of Asturias called Alfonso and three Kings of Leon called Alfonso.