[37] Robert Delort has clearly shown that the fashion for black furs was also a 15th century phenomenon. From the 1390s onwards, martens gradually replaced (but never completely) the other furs. Then around 1420, wild furs of Russian or Nordic origin competed with domestic pelts of Mediterranean origin, especially lambs. This fur, once humble, became an ornament appreciated by the nobles. Delort, Robert, Le commerce des fourrures en Occident à la fin du Moyen Age (vers 1300-vers 1450) (Paris, Ecole Française de Rome, 1978), p. 484