[1] Her dates of birth and death are disputed, though it is believed that she was born soon after the marriage of her parents in 1228 and died after she claimed Bigorre in 1283.
However, before Petronilla's death, she had handed control of the government over to Simon de Montfort, 6th Earl of Leicester, who interpreted the act as a gift and so did not allow Alice to claim her inheritance.
Gaston VII then invaded the county, forcing Eschivat to defend it, seeking alliances with the English and Roger IV, Count of Foix.
[4] In 1258, war resumed in the region and Eschivat agreed to temporarily surrender the County of Bigorre to Simon de Montfort, this time to end the conflict.
Soon after, Simon de Montfort rebelled against King Henry III of England, and Eschivat helped Gaston VII and Martha regain Bigorre.