 The Principality adopted the French franc as its currency, though few special local coins were minted.On 3 March 1809, as part of the Treaty of Fontainebleau, her brother Napoleon created the Grand Duchy of Tuscany, with Elisa ruling as Grand Duchess of all Tuscany from Florence.The region had been annexed to the French Empire two years before, from the former Kingdom of Etruria (1801-1807).