A river in Britain.
Possible locations include the Glem in Lincolnshire, the Glen in Northumberland, and the Glyme in Oxfordshire (Chambers, 202). The first is most probable, since Nennius places another of Arthur’s battles in a country called Linnuis, and Linnuis is likely Lindsey, in Lincolnshire.
Dane Hill | The Legend of King Arthur
Historia Brittonum | Probably Nennius, early 9th century
Idylls of the King | Lord Alfred Tennyson, 1859-1886