Cecilia of Normandy (or Cecily; c. 1056 – 30 July 1126) was a French abbess, thought to be the eldest daughter[2][3] of William the Conqueror and Matilda of Flanders.

[7] She was given a high education in the arts, Latin, rhetoric and logic by the scholar Arnulf of Chocques.

[8] Cecilia was entered into the Abbey of the Holy Trinity of Caen at a young age by her parents.

The convent was founded by her mother as a penance for her marriage, which was initially regarded as a prohibited degree of kinship, as well as during the preparations of the invasion of England.

[8] She introduced a number of improvements to the convent and functioned as the coadjutor or deputy of the abbess, her relative Matilda.