Mummers and "guisers" (performers in disguise) can be traced back at least to 1296, when the festivities for the marriage of Edward I's daughter at Christmas included "mummers of the court" along with "fiddlers and minstrels" [REF].
While mum(en)schanz was played not only by masked persons, and not only during carnival, the German word mummenschanz nevertheless took on the meaning "costume, masquerade" and, by the 18th century, had lost its association with gambling and dice.