Bertha of Blois (French: Berthe de Blois; c. 1005 — c. 1080), was a Duchess consort of Brittany and a countess consort of Maine.
Life Bertha was the daughter of Odo II, Count of Blois and Ermengarde of Auvergne. In 1029, she married Alain III, Duke of Brittany, he died in 1040. In 1046, she married Hugh IV, Count of Maine.
Marriage & issue Bertha and Alain had two children: Conan II, Duke of Brittany Hawise, Duchess of Brittany
With her second husband, Hugh IV, Count of Maine, Bertha had two children: Herbert II, Count of Maine Marguerite (1045 - 1063), betrothed to Robert Curthose
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