Wer datete Isabel de Sandoval?

Peter (Spanish: Pedro; 30 August 1334 – 23 March 1369), called Peter the Cruel (el Cruel) or the Just (el Justo), was King of Castile and León from 1350 to 1369. Peter was the last ruler of the main branch of the House of Ivrea. He was excommunicated by Pope Urban V for his persecutions and cruelties committed against the clergy.