She was suo jure Countess of Bigorre following the death of her mother in 1251. Alice was born sometime between 1217 and 1220. She was the eldest child of her mother, she had one full sister also named Petronilla, who went onto marry Raoul de la Roche-Tesson.
Her mother was married five times, her elder two daughters were the product of her third marriage.
A fifth marriage to Boson of Mastas, Seigneur de Cognac, produced a half-sister named Martha, who married Gaston VII, Viscount of Béarn. An agreement was reached, upon Petronilla"s death, Alice and Jordan would inherit Bigorre, whilst Martha would inherit her father"s lands of Mastas. The marriage between Alice and Jordan produced three children:
Eskivat (died 1283), succeeded his mother, married Mascarós II d"Armagnac, Countess of Armagnac and Fézensac but had no children.
Married firstly to Simon of Rochechouart, lord of Availles, and secondly to Viscount Raymond V of Turenne.
The couple had a daughter named Matilda who later married Philip of Chieti. In 1251, Petronilla died.
However, she had passed control of the government over to Simon de Montfort, 6th Earl of Leicester, Alice"s uncle. De Montfort had interpreted this act as a gift, so refused to hand Bigorre over to Alice on the death of her mother.
To prevent Guyenne and Gascony from rebelling, Henry III of England recalled Simon de Montfort and appointed John Grailly in his place.
However, Alice and her family re-claimed Bigorre during 1251. Alice reigned only for the next four years, dying in 1255.
