Livre tournois is a historical French currency that was used from the 12th century until the 19th century. It was originally based on the weight of silver and was divided into 20 sous, with each sous further divided into 12 deniers. The livre tournois played a significant role in the economy of medieval France and was used in various transactions, including trade and taxation. The term "livre" itself means "pound" in French, reflecting its origins in weight. Over time, the livre tournois was replaced by the franc during the monetary reforms of the late 18th century. Despite its discontinuation, the livre tournois remains an important part of France's monetary history.