Gaspar de Guzmán, 3rd Count of Olivares (1587–1645), who became 1st Count-Duke of Olivares in 1625
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The most prominent member of the House of Olivares was Gaspar de Guzmán, Count-Duke of Olivares, the favourite of Philip IV of Spain.
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The title comes from the municipality of Olivares in Seville, which was already owned by Pedro Pérez de Guzmán.
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The House of Olivares was constituted in 1539 when Charles I of Spain granted Pedro Pérez de Guzmán, son of Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia, the title of Count of Olivares (Sp. conde de Olivares).
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Pedro Pérez de Guzmán y Zúñiga (Sp.: Don Pedro Pérez de Guzmán y Zúñiga, primer Conde de Olivares) was the founder of the House of Olivares, a cadet branch of the House of Medina Sidonia.