Old French Money refers to the currency used in France prior to the introduction of the Euro. The three terms associated with Old French Money are Franc (5 letters), Ecu (3 letters) and Ecus (4 letters). Franc was the main currency used in France from the 13th century until the introduction of the Euro in 2002. Ecu was a gold coin used in France from the 15th century until the 18th century. Ecus was a silver coin used in France from the 15th century until the 18th century.