Castilian Civil War
To inflame matters, later in 1351, the Queen Dowager María de Portugal, ordered the assassination of the former lover of King Alfonso XI, Leonor de Guzmán who had been held prisoner in Talavera de la Reina. She had previously given birth to the twins Fadrique Alfonso de Castilla and Enrique II de Castilla, the latter of which had secretly married Juana Manuel de Villena y Núñez de Lara in July 1350. This murder further enraged the aristocracy and ignited the Castilian Civil War.