Cwm
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Cwm Cawlwyd
A glen where lived the magical Owl of Cwm Cawlwyd.
Arthur visited the owl to consult his wisdom during his quest to find the missing warrior Mabon in Culhwch and Olwen. The Owl of Cwm Cawlwyd directed Arthur to the Eagle of Gwernabwy. A Welsh Triad lists the Owl as one of the "three Elders of the World".
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Cwm Cerwyn
A valley or glen, probably in western England, where the boar Twrch Trwyth made a stand against Arthur’s warriors during the epic hunt, and killed Gwarthegydd, Tarawg, Rhun, Ysgonan, Gwydre, Garselid, Glew, and Ysgawyn.
Cwm, means a low place enclosed with hills in Welsh. The Saxonized form is comb or combe, which can be found in the name of cities, such as: Widecomb, Nettlecomb, Kingcombe.