Guiscarda (died 1154) was the eldest child of Gaston IV of Béarn

Gaston IV of Béarn

Gaston IV was viscount of Béarn from 1090 to 1131. He was called "le Croisé" due to his participation in the First Crusade....

 and Talesa of Aragon

Talesa of Aragon

Talesa, Talèse, Talèze, or Ataresa was an Aragonese noblewoman and relative of the royal Jiménez dynasty. She was the daughter of Sancho, Count of Aibar, natural brother of Sancho V of Navarre...

. She later succeeded her younger brother Centule VI

Centule VI of Béarn

Centule VI was the Viscount of Béarn from 1131 to his death. Like his father, he was an ideal Christian prince for his age, ready to serve the Church in the Reconquista....

 as viscountess in 1134.

Guiscarda first married Peter III of Gabarret, who died before she succeeded to Béarn. Her son by him, Peter II

Peter II of Béarn

Peter II was the Viscount of Béarn from 1134 to his death. He was also the viscount of Gabardan, Brulhois, and Gabarret ....

, also succeeded in 1134. Guiscarda's mother acted as primary regent, Guiscarda only secondarily. In 1147, Peter attained his majority and Guiscarda retired from her functions in government.

When Peter died in 1153, Guiscarda assumed the regency for his son Gaston V

Gaston V of Béarn

Gaston V was the Viscount of Béarn, Gabardan, and Brulhois from 1153 to his death.He was the son of Peter II and a Catalan princess. When his father died in 1153, he inherited his title under the regency of his grandmother Guiscarda...

, until her own death the next year.