The Louis d'or used to be a gold coin in circulation in which country?

The Louis d'or is any number of French coins first introduced by Louis XIII in 1640. The name derives from the depiction of the portrait of King Louis on one side of the coin; the French royal coat of arms is on the reverse. The coin was replaced by the French franc at the time of the revolution and later the similarly valued Napoleon. The actual value of the coins fluctuated according to monetary and fiscal policy, but in 1726 the value was stabilized.

The 1640 issue of Louis d’or contained five denominations: a half Louis and a one, two, four, and eight Louis. All subsequent issues through 1793 were only denominated in half, one, and two Louis.