Gwrgi Garwlwyd ("Man-Dog Rough-Grey") is a warrior character in Welsh Arthurian legend.
In Pa Gur, King Arthur and his men fight against an army of cinbin, or dogheads, at the mountains of Eidyn (modern Edinburgh).
[1] Welsh Triads 10W and 32 feature Gwrgi Garwlwyd ("Man-Dog" "Rough-Grey"), who can be identified with the character from Pa gur.
His death at the hands of Diffeidell mab Dissynyndawd, a bard and chieftain of Deira and Bernicia, is regarded as one of the "Three Fortunate Slayings".
[3] Scholar Rachel Bromwich notes the similarity of Gwrgi Garwlwyd's name to Germán Garbglas, an enemy of Cú Chulainn in the Ulster Cycle of Irish mythology, and suggests that they may both have been conceived as werewolves.