Pedro de Alcántara Alonso Pérez de Guzmán, 14th Duke of Medina Sidonia
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Pedro de Alcántara Alonso Pérez de Guzmán y Lopez-Pacheco, 14th Duke of Medina Sidonia (1724 – 1779) became Duke of Medina Sidonia in 1739.

He was married on 22 October 1743, aged around 19, to Mariana de Silva y Álvarez de Toledo, whose mother was known as María Teresa Álvarez de Toledo y Haro, was 11th Duchess of Alba de Tormes on her own right. He was became a Knight of the Order of the Golden Fleece
Order of the Golden Fleece
The Order of the Golden Fleece is an order of chivalry founded in Bruges by Philip III, Duke of Burgundy in 1430, to celebrate his marriage to the Portuguese princess Infanta Isabella of Portugal, daughter of King John I of Portugal. It evolved as one of the most prestigious orders in Europe...

 in 1753, aged 29. No issue, and title passed to his cousin.

He was elected a Fellow of the Royal Society in November 1749.
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