"The Tale of the Queen Who Sought a Drink From a Certain Well" (Scottish Gaelic: Sgeulachd Ban-Righ a dh' Iarr Deoch a Tobar Araid)[1] is a Scottish fairy tale collected by John Francis Campbell in Popular Tales of the West Highlands, listing his informant as Mrs. MacTavish, Port Ellen, Islay, and noting the story could be traced back to 1548.
The creature involved was called a losgann, which could be either a frog or a toad.
An ill queen sent each of her daughters to a well for healing water.
They each met a losgann who asked her to marry him, for a drink.
Finally, he told her to take down a rusty sword behind the bed and cut off his head.