Gaspar Juan Pérez de Guzmán, 10th Duke of Medina Sidonia noble (1630–1667) Parents Gaspar Alfonso Pérez de Guzmán, 9th Duke of Medina Sidonia Children Siblings Juan Alfonso Pérez de Guzmán y Guzmán Domingos de Gusmão Juan Alonso Pérez de Guzmán y Pérez de Guzmán Juan Claros Pérez de Guzmán, 11th Duke of Medina Sidonia