Career
Fernández de Velasco was born in Burgos, the son of Pedro Fernández de Velasco and of Beatriz Manrique. He became Camarero Mayor of King Henry IV of Castile, and viceroy and governor of Castile. In 1473 Henry IV named him sixth Constable of Castile and made this title hereditary in his family.
He participated in the conquest of Úbeda and Baeza, which both occurred on Saint Andrew"s day.
He also fought against the Moors in the battles of Gibraltar and Archidona and participated in the conquest of Granada, where he died. Bernardino Fernández de Velasco, 1st Duke of Frías, married
Blanca de Herrera, señora de Pedraza de la Sierra
Juana of Aragon, illegitimate daughter of Ferdinand II of Aragon.
Isabel Fernandez de Velasco, married Juan Alonso de Guzmán, 3rd Duke of Medina Sidonia.