On the trail of the charters of the Dukes of Brittany, from the Château de Nantes to the manuscripts of Rennes.
How to find a medieval document when you only know the name of a city or a signatory? Bretaigne DAO opens its research notebook. Two manuscripts preserved in Rennes serve as a starting point. In Nantes, a reference to the second treaty of Guérande provides an initial lead to verify.
