 A Carolingian denarius replaced the Merovingian one, and the Frisian penning, in Gaul from 755 to the 11th century.Merovingian coins are on display at the Monnaie de Paris in Paris; there are Merovingian gold coins at the Bibliothèque Nationale, Cabinet des Médailles.Christianity was introduced to the Franks by their contact with Gallo-Romanic culture and later further spread by monks.