Mercurius Artaius, a Gallo-Roman god, [274], [313].
Merlin, [324], [325], [339], [360], [361], [364].
See Myrddin.
Mesgegra, king of Leinster, [147], [154].
Meyer, Dr. Kuno, [38], [134], [154], [184], [190].
Miach, son of Diancecht, [62], [80]-82, [232].
Midas, the British, [328].
Mider, Gaelic god of the Under World, [56], [57], [117], [136], [140], [142], [147]-151, [154], [157], [175], [179], [205], [211]-213, [224], [243], [331]-333;