[Folklore] In Welsh, Cader means chair and Idris is the name of one of the old Welsh giants. Legend has it that anyone who passes the night in this 'chair' will either be a poet or a madman.
CADER IDRIS
Meaning of CADER IDRIS in English
Encyclopedia Mythica English dictionary. Английский энциклопедический словарь греческой мифологии. 2012