Isabella of Lusignan her half-brother King Henry III in 1254. After thirteen years of marriage Geoffery died. Isabella herself died on 14 January 1300 having most likely outlived all of her children. She had several grandchildren. Isabella also outlived all of her siblings (full and half). Isabella of Lusignan Isabella of Lusignan (c.1224 – 14 January 1300) was a daughter of Hugh X of Lusignan and his wife Isabella of Angoulême, Dowager Queen of England. Isabella was half-sister to King Henry III of England. She was Dame de Beauvoir-sur Mer et de Mercillac. Isabella's year of birth is unknown. She is mentioned in
Isabella of Angoulême 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. Isabella and