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) was a Spanish nobleman who became Duke of Medina Sidonia in 1636, upon the death of his father Juan Manuel Pérez de Guzmán, 8th Duke of Medina Sidonia. He was one of the architects of the Andalusian independentist conspiracy (1641).
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