Afonso IV of Portugal
In addition to having served King Denis, Gonçalo Anes de Briteiros swore loyalty to Afonso IV of Portugal, serving in his court until his death. He was married to Sancha de Guzmán, daughter of and Inés Fernandes de Lima, belonging to a noble family of Castile. His wife was the granddaughter of Juan Pérez de Guzmán, lord of Gumiel de Mercado.