The nation of France as we know it did not exist at that time and there was no standardized currency among the kingdoms that made up the crown. Livres, sous, and deniers were the standard unit of accounting but each major polity produced their own coinage. Kings also sometimes devalued their currencies to help pay for wars so traders preferred to use more stable currencies like Spanish and Dutch coins (Louis XIII did a major devaluation about a decade after the time period of the book, which colored perceptions of the time).

It was very common before nationalism and the standardization of currencies. I read primary sources about conquistadors and the contracts financing and supplying the expedition might involve a dozen currencies because each trader supplying the wood, food, animals, etc would work in their own preferred/local currency.

One niggle: France was mostly made up of duchies, not kingdoms. The King of France had allegiance from some of the duchies making up modern France, but notably Burgundy was the one who captured Jeanne d'Arc (Joan of Arc) and turned her over to the English - so clearly not all.

Not sure about the Occitan; IIRC Eleanor was considered a queen in her own right as rule of Aquitaine, not a duchess.