The Louis d'or (a gold coin) replaced the
franc which had been in circulation (in theory) since
John II. In actual practice the principal gold coin circulating in France in the earlier 17th century had been Spanish: the 6.7-gram double
escudo or "
doubloon", of which the ''Louis d'or
was an explicit copy. There also existed a half-Louis coin (the demi-louis d'or
) and a two-Louis coin (the double louis d'or''). The Louis d'or fixed several problems with previous French gold coinage.
Louis XIII previously struck coins from 23 carat gold even though
Charles V had made 22 carats the de facto international standard for gold coinage a century earlier. Royal edicts had set the official values of his gold coins so low that it was profitable to export them. or two escudo coins, which was an international trade currency. Smaller values were available through a number of silver coins – the
écu (sometimes called the ''louis d'argent
), also available in , and écu denominations (60, 30 and 15 sous
) – and copper coins: sous (s
.) and deniers (d''.). The Louis d'or under Louis XIII had a dimension of about 25 mm, and a weight of 6.75 g. • Recto: the king's head turned to the right with the
motto "LVD XIII DG – FR ET NAV REX" (LVDOVICVS XIII DEI GRATIA FRANCIAE ET NAVARRAE REX "Louis XIII, by the grace of God king of France and of Navarre"). • Verso: the royal
monogram (4 double "L"s surmounted by a crown with
fleur de lis) and the motto "CHRS REGN VINC IMP" (CHRISTVS REGNAT VINCIT IMPERAT "Christ reigns, conquers and commands"). • Engraver:
Jean Varin (1604–1672) The double louis has a size of 28.5 mm and a weight of 13.47 g. The quatruple louis has a size of 35 mm and a weight of 26.88 g. The 10 louis has a size of 44 mm and a weight of 66.87 g. One of these was sold in 2012 for 210,000 euros, which makes it the most expensive French coin of any time. The half louis has a size of 20 mm and a weight of 3.34 g. ==Louis XIV==