The Probert Encyclopaedia of Money

FRANC

The franc was the former principle monetary unit of France and later Belgium and is the principle monetary unit of Switzerland, Burundi, Cameroon, Rwanda and some other countries. The first French franc was struck, in gold, in 1360 and bore an impression of John II on horseback. The name franc was given from the device Francorum Rex, king of the French, on the coin when first struck.
Research Franc