The castle does not re-appear in contemporary historical records from the time of Ptolemy until around AD 600. Then, in the epic Welsh poem Y Gododdin there is a reference to Din Eidyn, the stronghold of Eidyn. This has been generally assumed to refer to the Castle Rock. The poem tells of the Gododdin King Mynyddog Mwynfawr, and his band of warriors, who, after a year of feasting in their fortress, set out to do battle with the Angles at Catreath (possibly Catterick) in Yorkshire. Despite performing glorious deeds of valour and bravery, the poem relates that the Gododdin were massacred.