 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.