Alfonso Pérez de Guzmán, 5th Duke of Medina Sidonia Spanish duke (1500–1549) Parents 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 Enrique Pérez de Guzmán, 4th Duke of Medina Sidonia Partners Ana de Aragón y Gurrea