#onThisDay in 1977 #MadameXanadu debuted in @DC.com #DoorwayToNightmare #comics #1 mysterious #gothicComics #seriesHostess revealed as #NimueInwudu of #ArthurianLegend #MorgaineLeFey’s #sister & #TheLadyOfTheLady #formerLoverAndAdversary of #Merlin #JohnConstantine ancestor + #JohnZatara’s ex