The central figure of the pig has parallels with the great boars of Welsh-language literature and the Matter of Britain, particularly Twrch Trwyth in the 11th-century Welsh story of Culhwch and Olwen.
But a richly elaborate account of the great hunt appears in the Welsh prose romance Culhwch and Olwen, probably written around 1100 CE.
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A passing reference to Twrch Trwyth also occurs in the elegy Gwarchan Cynfelyn preserved in the Book of Aneirin.
Tom Shippey, in The Road to Middle-earth (pp. 193–194) says that the hunting of the great wolf recalls the chase of the boar Twrch Trwyth in the Welsh Mabinogion, while the motif of 'the hand in the wolf's mouth' is one of the most famous parts of the Prose Edda, told of Fenris Wolf and the god Týr; while Huan recalls several faithful hounds of legend, Garm, Gelert, Cafall.