Juan Alfonso Pérez de Guzmán y Guzmán (1601–1699) Parents Gaspar Alfonso Pérez de Guzmán, 9th Duke of Medina Sidonia Children Siblings Gaspar Juan Pérez de Guzmán, 10th Duke of Medina Sidonia Domingos de Gusmão Juan Alonso Pérez de Guzmán y Pérez de Guzmán Juan Claros Pérez de Guzmán, 11th Duke of Medina Sidonia