Madog Elfed

Madog Elfed (Modern Welsh spelling; Madawc Elvet in standardised Middle Welsh spelling) is a hero mentioned in the medieval Welsh poem "Y Gododdin", set sometime around 600, who fights and dies at the Battle of Catraeth. His real place in history has been the subject of debate.
The name "Madog" appears several times in "Y Gododdin". In one stanza, it is associated with the epithet "Elfed":
This is the only stanza clearly to refer specifically to a 'Madog Elfed', but the other mentions of a 'Madog' are usually assumed to refer to the same character: the poem has warriors returning to 'Madog's tent' ('Pebyll Madawc'). Stanza 31 mentions him in passing alongside other fallen warriors. It is possible but not certain that we are to imagine Madog as king of Elfed.
The Elfed in Madog's epithet has traditionally been assumed to refer to the Brittonic kingdom of Elmet in what is now West Yorkshire, in which case "Y Gododdin" provides interesting evidence for the salience of this kingdom in either post-Roman history, later Welsh literary imagination, or both. However, recent work has suggested that the name "Elfed" could have occurred elsewhere in Britain too, including Elvet near Durham, and Elvet Hundred in Carmarthenshire, and that Madog Elfed might in fact have been imagined to have come from either of those.