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 I of Castile marriages were over. There was talk of a marriage to Edward IV of England or to one of his brothers, probably Richard, Duke of Gloucester, but this alliance was never seriously considered. Once again in 1468, a marriage proposal arrived from Alfonso V of Portugal. Going against his promises made in September, Henry tried to make the marriage a reality. If Isabella married Alfonso, Henry's daughter Joanna would marry Alfonso's son John II and thus, after the death of the old king, John and Joanna could inherit Portugal and Castile. Isabella refused and made a secret promise to marry her