1) Welsh legendary creature 
Gwyllion or gwyllon (plural noun from the singular Gwyll or (Yr) Wyll `twilight, gloaming`) is a Welsh word with a wide range of possible meanings including `ghosts, spirits,` `night-wanderers (human or supernatural) up to no good, outlaws of the wild` etc. Gwyllion is only one of a number of words with these or similar meanings in Welsh. It...