By her father’s death, Isabella became Countess of Angoulême in her own right.
On April 16, 1202, following the death of her father, Count Aymer of Angoulême, Isabella succeeded to the title of Countess of Angoulême. This elevation to a sovereign noblewoman was significant in the feudal landscape of medieval France. Possessing the county 'jure hereditario' meant she controlled essential territories in the southwest of France, increasing her political clout, aligning with regional power centers, and establishing her significance beyond her marriage.