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
Máel Coluim, son of the king of the Cumbrians of the king of the Cumbrians" from "Historia regum Anglorum". The "Chronicle of Melrose" may therefore be the earliest source to explicitly associate Máel Coluim mac Donnchada with the events of 1054. As as result of this identification, this Scottish monarch was portrayed as a man who only possessed his throne on account of English assistance. The catalyst behind the monks' misrepresentation of Siward's invasion appears to have been an English revolt dating to 1173 and 1174, when the reigning King of Scotland—a great-grandson of Máel Coluim mac Donnchada—backed a failed rebellion against the King of England. As a result