Scotland
A major kingdom, Scotland probably included the territory from Hadrian's Wall northward, with nine subkingdoms; Benoye, Estrangor, Garloth, l'Isle Estrange, the Long Isles, Lothian, the North Marches, Orkney, and Pomitain.
Chrétien de Troyes mentions that Arthur swelled his army with reinforcements drawn from Scotland.
Escoce | The Legend of King Arthur
Glasgow | The Legend of King Arthur
Islay | The Legend of King Arthur
Molendinar Burn | The Legend of King Arthur
Scots | The Legend of King Arthur
Queen of Scotland | The Legend of King Arthur