Nicole was the daughter of Charles, Seigneur d'Avaugour, and Isabeau de Vivonne.

When her elder uncles, Olivier and John II died, she succeeded to the county of Penthièvre as primogeniture heir.

With her succession, she also inherited the Penthièvre claim to the Breton ducal throne.

On 3 January 1480, she sold her rights to Brittany to Louis XI of France for 50,000 livres.

[2] Nicole married on 18 June 1437 Jean II de Brosse (1423 – 1482),[1] with whom she had: