On January 1, 1999, the euro came into existence as a European common currency (currency of Economic and Monetary Union). Additionally, euro has become a legal tender in states and countries outside euro zone. In Europe, San Marino, the Vatican, Monaco and Andorra have adopted euro. With the introduction of the euro, it was necessary to redefine monetary relations with these countries which had no national currency but which used the former national currencies of Member States of the euro zone. Euro has become a legal tender also in French overseas department and territories which formerly used French francs: Mayotte, Saint Pierre and Miquelon, Martinique, French Guiana, Reunion, and Guadeloupe on the basis of a decision of the Council or ...