The livre tournois (; ; abbreviation: ₶ or £) was one of numerous currencies used in medieval France, and a unit of account (i.e., a monetary unit used in accounting) used in early modern France.
The 1262 monetary reform established the livre tournois as 20 sous tournois, or 80.88 of Fineness. The franc à cheval was a gold coin of one livre tournois minted in large numbers from 1360. In 1549, the livre tournois was decreed a unit of account, and in 1667 it officially replaced the livre parisis. In 1720, the livre tournois was redefined as 0.31 grams of pure gold, and in 1726, in a devaluation under Louis XV, as 4.50516 grams of fine silver. It was the basis of the revolutionary French franc of 1795, defined as 4.5 grams of fine silver exactly.
The livre tournois was, in common with the original French livre, divided into 20 sols (sous after 1715), each of which was divided into 12 French denier.
Between 1360 and 1641, coins worth one livre tournois were minted, known as French franc]] (the name coming from the inscription Johannes Dei Gratia Francorum Rex, ). Other francs were minted under Charles V, Henry III and Henry IV. The use of the name "franc" became a synonym for livre tournois in accounting.
The first French paper money, issued between 1701 and 1720, was denominated in livre tournois (see "Standard Catalog of World Paper Money", Albert Pick). This was the last time the name was used officially, as later notes and coins were denominated simply in livres, the livre parisis having finally been abolished in 1667.
The official use of the livre tournois accounting unit in all contracts in France was legislated in 1549, but it had been one of the standard units of accounting in France since the 13th century. In 1577 the livre tournois accounting unit was officially abolished and accountants switched to the écu, which was at that time the major French gold coin in actual circulation, but in 1602 the livre tournois accounting unit was brought back. (A monetary unit of accounting based on the livre parisis continued to be used for minor uses in and around Paris and was not officially abolished until 1667 by Louis XIV).
Since coins in Europe in the Middle Ages and the early modern period (the French écu, Louis, teston d'argent, French denier, double, franc; the Spanish doubloon, pistole, Spanish real; the Italian florin, ducat or sequin; the German and Austrian thaler; the Dutch gulden, etc.) did not have any indication of their value, their official value was determined by royal edicts. In cases of financial need, French kings could use the official value for currency devaluation. This could be done in two ways: (1) the amount of precious metal in a newly minted French coin could be reduced while nevertheless maintaining the old value in livre tournois or (2) the official value of a domestic or foreign coin in circulation could be increased. By reversing these techniques, currencies could be reinforced.
For example:
Royal finance officers faced many difficulties. In addition to currency speculation, forgery and the coin clipping (which was harshly punished), they had the difficult problem of setting values for gold, silver, copper and billon coins, responding to the often large influx of foreign coin and the appearance of inferior foreign coins of intentionally similar design. For more on these issues, see Monetary policy and Gresham's law.
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