Philip had previously recognised John as suzerain of Anjou and the Duchy of Brittany, but with the treaty of Le Goulet he extorted 20,000 marks sterling in payment for recognition of John's sovereignty of Brittany.
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Batz was historically part of the Duchy of Brittany and is very near to the south-eastern limit of the area in which there is evidence of Breton settlement in the early Middle Ages.
From the middle of the ninth century these counts were Bretons with close ties to the Duchy of Brittany, which they often vied to rule.
There was a close association with the Duchy of Brittany from the inception of the honours and titles associated with Richmond until the reign of John V.
If the King Louis XII were to die without producing a male heir, Charles of the House of Habsburg would receive as dowry the Duchy of Milan, Genoa and its dependencies, the Duchy of Brittany, the counties of Asti and Blois, the Duchy of Burgundy, the Viceroyalty of Auxonne, Auxerrois, Mâconnais and Bar-sur-Seine.
In 1341 on the death of John III, the couple assumed the rule of the duchy of Brittany, Charles having been granted permission to perform homage by King Philip VI by the arrêt of Conflans on 7 September 1341.