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He soon was at the center of a group of art connoisseurs and historians that stretched from Paris to the court of the Grand Duke of Tuscany in Florence.
The Galleria dell'Accademia was founded in 1784 by Pietro Leopoldo, Grand Duke of Tuscany.
In 1608 prince Fakhr-al-Din II of Lebanon concluded a secret economic and military alliance with the Grand Duke of Tuscany against the Ottoman hegemony.
Balfour notably served as Scottish Ambassador to the Grand Duke of Tuscany and the Duke of Lorraine in 1606 and was a member of the Scottish Privy Council.