Álvaro Pires de Castro (sometimes written as "Peres de Castro" or "Pérez de Castro") was the illegitimate son of the powerful Galician nobleman Pedro Fernández de Castro and his mistress Mayor Leguizamon.
Pedro Fernández de Castro, who had promised King Alfonso XI to help in the fight against Juan Manuel, went with his troops to Peñafiel and challenged Juan Manuel to fight.
Their children were Diego, Elvira, Gil, Gonzalo, Inés, Juan, Manrique, and Jimena, who married Pedro Fernández de Castro.
Pedro de Lara (1348–1384), Count of Mayorga, who married Beatriz de Castro, daughter of Álvaro Pérez de Castro and Maria Ponce de Leon, and granddaughter of Pedro Fernández de Castro.
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Juan Núñez de Lara, Juan Manuel, Pedro Fernández de Castro, Juan Alfonso de la Cerda, lord of Gibraleón, knights of France, England and Germany, and even King Philip III of Navarre, king consort of Navarra, who came accompanied by 100 horsemen and 300 infantry all participated in the siege.
She was betrothed to Fernando Alfonso de Castilla y Guzmán, lord of Ledesma and illegitimate son of Alfonso XI of Castile, and later married Alvar Pérez de Castro, Count of Arraiolos and son of Pedro Fernández de Castro the Warrior, Lord of the House of Castro.
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