 Though Queen mother of England, Isabella was now mostly regarded as a mere Countess of La Marche and had to give precedence to other women.In 1241, when Isabella and Hugh were summoned to the French court to swear fealty to King Louis IX of France's brother, Alphonse, who had been invested as Count of Poitou, their mother, the Queen Dowager Blanche openly snubbed her.This so infuriated Isabella, who had a deep-seated hatred of Blanche for having fervently supported the French invasion of England during the First Barons' War in May 1216, that she began to actively conspire against King Louis.