sentences:  Leonor arranged her marriage to Juan Alfonso Pimentel, first Count of Benavente, who supported the cause of the Castilian king during the succession crisis and was exiled to that kingdom.Leonor was also the niece of João Afonso Telo, fourth Count of Barcelos and first Count of Ourém, whose daughter, Leonor, was the wife of Pedro de Castro "The One-eyed", son of Álvaro Pires de Castro, Count of Arraiolos, Lord de Cadaval and Ferreira, Constable of Portugal, and brother of Inês de Castro, mistress (and alleged secret wife) of King Peter I of Portugal.The Teles de Meneses and the Castros were among the most powerful and influential families in the kingdoms of Leon, Castile and Portugal.