Claim: The County of Nantes, which served as a march against the Bretons of the Vannetais, finally fell to the Bretons and the title became a subsidiary title of the Breton rulers in the mid-ninth century.
Evidence: Their county served as a march against the Bretons of the Vannetais. In the mid-ninth century, the county finally fell to the Bretons and the title became a subsidiary title of the Breton rulers.