Gaspar Alfonso Pérez de Guzmán, 9th Duke of Medina Sidonia
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Gaspar Alfonso Pérez de Guzmán y Sandoval, 9th Duke of Medina Sidonia (1602 – 1664) became Duke of Medina Sidonia in 1636, upon the death of Juan Manuel Pérez de Guzmán, 8th Duke of Medina Sidonia
Juan Manuel Pérez de Guzmán, 8th Duke of Medina Sidonia
Juan Manuel Pérez de Guzmán y Silva , was a Spanish noble and 8th Duke of Medina Sidonia.He was the son of Alonso Pérez de Guzmán, 7th Duke of Medina Sidonia, commander-in-chief of the Spanish Armada and Ana de Silva y Mendoza, daughter of Ana de Mendoza, Princess of Éboli.He married in 1598, aged...

.

In 1622, aged 20, he married his 15-year-old aunt Ana María de Guzmán (1607–1637), having four children by her, of which only the youngest, Gaspar Juan, survived to inherit the title.

In 1639 the 9th Duke was married for a second time to Seville noblewoman Juana Fernández de Córdoba, but only after signing documents giving the considerable amount of 20,000 Ducados
Ducados
Ducados may refer to:* Duchy or dukedom and governed by a Duke or Duchess regnant* A form of currency used in old Spain, a local version of the ducat*In the plural:Ducados, A brand of cigarettes from Spain...

 to Margarita Marañon, on condition she become a nun near his palace in Sanlúcar de Barrameda
Sanlúcar de Barrameda
Sanlúcar de Barrameda is a city in the northwest of Cádiz province, part of the autonomous community of Andalucía in southern Spain. Sanlúcar is located on the left bank at the mouth of the Guadalquivir River opposite the Doñana National Park, 52 km from the provincial capital Cádiz and...

, later in a Dominican convent. It is said she was the mother of his illegitimate daughter, Luisa.

In 1640, his sister Luisa of Guzman became the new Queen of Portugal, as the wife of the former Duke of Braganza, now John IV of Portugal
John IV of Portugal
|-|John IV was the King of Portugal and the Algarves from 1640 to his death. He was the grandson of Catherine, Duchess of Braganza, who had in 1580 claimed the Portuguese crown and sparked the struggle for the throne of Portugal. John was nicknamed John the Restorer...

. In 1641 the 9th Duke led the Andalusian rebellion against Spanish rule
Andalusian independentist conspiracy (1641)
The Andalusian independentist conspiracy in 1641 was an alleged conspiracy of Andalusian nobility for Andalusia to secede from Spain. The conspiracy was brought to an end in summer 1641 after the plans of rebellion were discovered....

. Though both Portugal and Catalonia had strong cultural identities, an historical record of independence, and popular support, Andalusia did not, and the rebellion failed. The duke had the support of his brother-in-law, John IV of Portugal
John IV of Portugal
|-|John IV was the King of Portugal and the Algarves from 1640 to his death. He was the grandson of Catherine, Duchess of Braganza, who had in 1580 claimed the Portuguese crown and sparked the struggle for the throne of Portugal. John was nicknamed John the Restorer...

, but the promised naval aid from France and the Netherlands did not arrive. The king of Spain forgave his treason, but the previous prestige of his house was only regained by his successor.
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