The death of Peter I in 1369 Curiosity · Montiel, Campo de Montiel, Ciudad Real Image of Montiel, not of the place itself. On 23 March 1369, after the battle of Montiel and nine days under siege in the Castillo de la Estrella, Pedro I of Castile died at the hands of his half-brother Enrique de Trastámara, changing the course of the Castilian monarchy. Photo: Español002 (CC BY-SA 4.0) What to see and do in Montiel