Jean-Gabriel Eynard although belonging to a family who had settled in Switzerland since the 17th century was actually born in Lyon, France - where his father owned a business - on 28 December 1775.
[citation needed] In 1801, he entered in a highly speculative and hazardous financial venture becoming the sole subscriber to a bond issued by the duke of Etruria.
In 1803, he moved to Florence called forth by the Queen of Etruria, and thence he devoted much zeal and talent to the reformation and improvement of the finances of the Principality of Lucca and Piombino and he was also successful with those of the Tuscan state.
Under the reign of Elisa Bonaparte, Napoleon's sister, as Grand-Duchess of Tuscany he continued his work with much success and was showered with honours and privileges.
In 1809, he spent a long time in Paris in order to await the Emperor's return having been entrusted with the mission of thanking him, on behalf of both the Mediterranean Department and the Chamber of Commerce of Livorno, for the nomination of Elisa as Grand Duchess.