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 after being publicly snubbed by his mother, Blanche of Castile, for whom she had a deep-seated hatred. In 1244, after the plot had failed, Isabella was accused of attempting to poison the king. To avoid arrest, she sought refuge in Fontevraud Abbey, where she died two years later, but none of this can be confirmed. Isabella was the only daughter and heir of Aymer Taillefer, Count of Angoulême, by Alice of Courtenay, who was sister of Peter II of Courtenay, Latin Emperor of Constantinople and granddaughter of King Louis VI of France. Isabella became Countess of Angoulême in her own