Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia

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Don Juan Alfonso Pérez de Guzmán y Afán de Ribera, 3rd Duke of Medina Sidonia (February 1464 – 1507) inherited the title in 1492, aged 28. In 1502, as Gibraltar was transferred to the Crown, the Marquisate of Gibraltar disappeared.

His mother is known as Leonor de Mendoza y Ribera, although he was known by using as his second name "Afan de Ribera". This could be because his mother was a Mendoza and it was not unknown for women and ecclesiastics to use the name of their mother, in spite of her father being an "Afan de Ribera".

He married twice, being the father of the 4th, 5th and 6th Duke.

His daughter, Leonor Pérez de Guzmán y Pérez de Guzmán, married Jaime I, Duke of Braganza, the most powerful noble in all of Portugal, and one of the most powerful nobles in all of Iberia.

Spanish nobility
Preceded by
Enrique de Guzmán
Duke of Medina Sidonia
1492–1507
Succeeded by
Enrique Pérez de Guzmán