Cadair Idris

Cadair Idris takes its name from a figure who stands between mythology and history: possibly a wise giant of ancient Welsh tradition, possibly a seventh-century king. The mountain's sacred significance likely reaches back to Celtic and possibly earlier times, though archaeological evidence is limited. The madness-or-poetry legend first appears in sixteenth-century records and gained wide fame through Romantic-era poetry.

According to the Welsh Triads, Idris was one of the Three Blessed Astronomers of the Island of Britain, a giant versed in poetry, philosophy, and the study of stars. He made the summit of this mountain his chair for contemplating the heavens and the trials of humanity. The three large boulders at the mountain's base are said to be pebbles he once shook from his shoe. His seat on the summit allowed him to observe the movements of celestial bodies and perhaps the movements of fate itself.

An alternative tradition identifies Idris with Idris ap Gwyddno, a seventh-century king of Meirionnydd who won a battle against Irish invaders on the mountain's slopes. Medieval genealogies call him Idris Gawr, the Giant, though this may be a corruption of an earlier name. Whether the king inherited the giant's mythology or the giant absorbed a historical memory remains unclear. Perhaps, in the Welsh imagination, the two were never fully separate.