"And Cai is standing in the middle of the hall floor"

Cai  appears in four of the other tales of The Mabinogion: ‘The Lady of the Well’, ‘Geraint son of Erbin’, ‘How Culhwch won Olwen’ and ‘The Dream of Rhonabwy’. He is also referred to in the Welsh Triads and in the poem ‘Pa gur’ which is preserved in the 13th century Black Book of Carmarthen (Llyfr Du Caerfyrddin).

In Arthurian literature he is a widespread though peripheral figure, usually portrayed as Sir Kay, one of the Knights of the Round Table, and often linked to Bedivere (Bedwyr). As in The Mabinogion, he is sometimes presented as a rather fiery, cantankerous individual.