The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "Bertha of Blois" – news · newspapers · books · scholar · JSTOR (December 2022) (Learn how and when to remove this message)

Bertha of Blois (French: Berthe de Blois; c. 1005 — c. 1080), was a Duchess consort of Brittany and a countess consort of Maine.

Bertha was the daughter of Odo II, Count of Blois and Ermengarde of Auvergne.^[1] In 1029, she married Alain III, Duke of Brittany,^[2] he died in 1040.^[3] In 1046, she married Hugh IV, Count of Maine.^[1]

Bertha and Alain had two children:

• Conan II, Duke of Brittany^[4]
• Hawise, Duchess of Brittany^[5]

With her second husband, Hugh IV, Count of Maine, Bertha had two children:

• Herbert II, Count of Maine^[6]
• Marguerite (1045 - 1063), betrothed to Robert Curthose^[6]

• Crouch, David (2007). The Normans. Hambledon Continuum.
• Douglas, David Charles (1966). William the Conqueror. University of California Press.
• Evergates, Theodore, ed. (1999). Aristocratic Women in Medieval France. University of Pennsylvania Press.
• Hagger, Mark S. (2017). Norman Rule in Normandy, 911-1144. The Boydell Press.
• Warren, Wilfred Lewis (1973). Henry II. University of California Press.