Thomas Jefferson was the second Minister Plenipotentiary to France (as far as I can tell, this means that he was the ambassador to France). He was Benjamin Franklin’s replacement. In fact, when he first arrived in Paris, someone is supposed to have actually asked if he was Franklin’s replacement, to which he is reputed to have responded “No one can replace him. I am only his successor.”
Part of the Place des États-Unis is actually Square Thomas Jefferson.