Louis dor is a popular gold coin that was first minted in France in the 17th century. This coin was widely used across Europe as a measure of value for international trade. Over time, the term louis dor has become synonymous with other similar coins, such as the Double Eagle, Sovereign, and Krugerrand. These coins are all made of gold and are often used as an investment or a store of value. Despite their differences in name and appearance, these coins all represent the same thing: a tangible and enduring asset that can be held and traded for value.