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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.