Alvaro Perez De Guzman 
Alvaro Perez De was born about 1255. Alvaro Perez De's father is Pedro Guillem De Guzman and his mother is Theresa Rodriguez De Brizuela. He had a half-brother named Alonso Perez De.General Notes
SOURCES: "Ancestors/Descendants of Royal Lines" (Contributors: Manuel Abranches de Soveral, Reynaud de Paysac, H.R. Moser <Burke Peerage>), O.Guionneau, L.B. de Rouge, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842, and E. Lodge>) http://geneastar.org.
They have a son named Pedro Nunes De.