Afonso of Portugal (c. 1288 –Lisbon, c. 1300;Portuguese pronunciation:[ɐˈfõsu]; English:Alphonzo orAlphonse) was aPortuguese noble, son ofAfonso of Portugal, Lord of Portalegre and his wifeViolante Manuel. He was granted the title of Lord ofLeiria. Afonso of Portugal died in 1300 when he was about twelve years of age without having married and without leaving any offspring.

• González-Doria, Fernando (2000).Diccionario heráldico y nobiliario de los Reinos de España (1ª ed.). San Fernando de Henares (Madrid): Ediciones Trigo S. L.ISBN 84-89787-17-4.
• De Loaysa, Jofré (1982). García Martínez, Antonio (ed.).Crónicas de los Reyes de Castilla Fernando III, Alfonso X, Sancho IV y Fernando IV (1248-1305) (in Latin and Spanish) (2nd ed.). Murcia: Academia Alfonso X el Sabio.ISBN 84-00-05017-7.
• Menéndez Pidal de Navascués, Faustino (1982). Instituto Luis de Salazar y Castro (ed.).Heráldica medieval española. Vol. I: La Casa Real de Castilla y León. Hidalguía.ISBN 84-00-05150-5.
• Menezo Otero, Juan José (2005).Reinos y Jefes de Estado desde el 712 (5ª ed.). Madrid: Historia Hispana.ISBN 84-604-9610-4.

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