 The "Glain Neidr" or "Maen Magi" of Welsh folklore is also closely connected to Druidism.The "Glain Neidr" of Wales are believed to be created by a congress of snakes, normally occurring in spring, but most auspicious on May Eve.Although not named as Glain Neidr, magic stones with the properties of adder stones appear frequently in Welsh mythology and folklore.