She was known as Blanche of Acre. She was the Lady of Loupeland and Baroness Tingry.
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On 25 Feb 2019 at 05:51 GMT Anonymous (Holland) Carroll wrote:
Guillaume (or William) married Blanche De Brienne, daughter of Jean de Brienne, by his 1st wife, Jeanne, daughter of Geoffroi Vicomte of Chateaudun. They had two sons, Jean (or John) and Robert [Seneschal of Ponthieu], and five daughters, Isabeau, Yolande, Margaret, Joan, and Agnes (nun).
On 25 Feb 2019 at 05:39 GMT Anonymous (Holland) Carroll wrote:
Blanche de Brienne, married William (or Guillaume) de Fiennes.
On 12 Jan 2019 at 20:07 GMT Anonymous (Holland) Carroll wrote:
Jean De Brienne (also styled Jean De Acre), married (1st) Jeanne De Chateaudun. They had one daughter, Blanche (wife of William De Fiennes).