Beatrice of Brittany
Béatrix of Brittany (1295–1384), Lady of Laval, Vitré and Hédé, was a daughter of Arthur II, Duke of Brittany, and Yolande of Dreux. In 1315 she married Guy X de Laval; their three children included Guy XII de Laval and Catherine.
Her husband was killed and her son captured at the battle of La Roche-Derrien in 1347, and Béatrix raised the large ransom that freed him. She died in 1384 and was buried in Clermont Abbey.