جواو الرابع
His father was Bernardino Fernández de Velasco, 6th Duke of Frías and his mother Isabel Maria de Guzmán. King John IV of Portugal was his cousin. He married Maria Teresa de Benavídes Dávila y Corella and had one daughter, María Remigia, VII Marquesa de Berlanga(c. 1678 to 1734).