It is not surprising that the history of Peter was rewritten in later years. Male descendants of King Henry II, the bastard half-brother of King Peter, and his slayer, would end up marrying female descendants of Peter. Henry III, who was grandson of Henry II, would marry Catherine of Lancaster, the daughter of John of Gaunt, the Duke of Lancaster, and Constance of Castile, daughter of Peter. Thus subsequent descendants of the joined lines would try to ameliorate the iniquity of Peter chronicled by the faction of Henry II. Bourbon rulers had a stake in sanctifying the image of Blanche, a distant member of their ancestral lineage.