She was married towards 1085 in a move by Gaston's father Centule V of Béarn to expand his influence across the Pyrenees by allying himself with the ruling house of Aragon and Navarre.
Centule died in the Battle of Fraga in 1134 and the viscounty passed to the son, Peter II, of Guiscarda, Talesa and Gaston's eldest daughter.
In that same year, Aragon and Navarre experienced a succession crisis, as Talesa's cousin Alfonso the Battler died without heirs and leaving a testament by which his realm was to pass to the military religious orders.
The two kingdoms split and the throne of Aragon was contested by Ramiro the Monk, the dead king's brother, and Alfonso VII of León, a more distant relative.
After papal intervention, the conflict was finally settled in favour of Raymond Berengar IV of Barcelona, who, to recover good relations with Béarn, granted Talesa the fiefs of Huesca and Bespen with rights over the Basilica of Our Lady of the Pillar in Zaragoza, where Gaston lay buried.