The counts of Nantes were originally the Frankish rulers of the Nantais under the Carolingians. 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.

[edit] Frankish counts

• 786 – 818 Guy, as prefect of the Breton March
• 818 – 831 Lambert I
• 831 – 841 Ricwin
• 841 – 843 Renaud
• 843 – 846 Lambert II
• 846 – 849 Amaury, imposed by Charles the Bald in opposition to Lambert II
• 849 – 851 Lambert II (restored)