The Nobiliario of Pedro Conde de Barcelos names "D. Alonso, D. Constança" as the children of "D. Dionis…Rey de Portugal" and his wife "D. Isabel". The Chronicon Conimbricensi records the birth “VI Id Feb” in 1291 of “Dñs Alfonsus filius…Dñi Dionisii Regis Portug. et Algarbii et Reginæ Doñæ Elizabeth”.
He rebelled against his father, provoked by the honours bestowed on his illegitimate half-brothers. The testament of “D. Diniz...Rey de Portugal e do Algarve”, dated 20 Jun 1322, made bequests to “Infante Dona Maria minha neta...Infante Dom Affonso meu filho...”.
He succeeded his father 1325 as AFONSO IV "o Osado/the Bold" King of Portugal.
His forces fought with Castile to defeat the Moroccans at Salado in 1340. The testament of “D. Affonso IV...Rey de Portugal e do Algarve”, dated 24 Mar 1345, requested burial “na Igreja Cathedral de Lisboa”, and names “Raynha D. Breatis...Infante D. Pedro nosso filho primeiro herdeiro”.
The Chronicon Conimbricensi records the death 29 May 1357 of “Rey D. Alfonso ò quarto, e filho do…Rey D. Denis” in “a Cidade de Lizboa” and his burial “à See de ditta Cidade”. 1
Also known as Afonso IV DINISEZ, King of Portugal