Enrique Pérez de Guzmán, 4th Duke of Medina Sidonia (1494-1513) (1494–1513) Parents Isabel de Velasco y Mendoza Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia Children Siblings Juan Alfonso Pérez de Guzmán, 6th Duke of Medina Sidonia Pedro Pérez de Guzmán, 1st Count of Olivares Alfonso Pérez de Guzmán, 5th Duke of Medina Sidonia Partners Doña Maria Téllez-Girón