Chinmark, Kinard, Kinnard of Striguil
The earl of Tréguier who fought for Arthur in the campaign against Rome. He died at the battle of Soissons.
Layamon alters his name and kingdom to Kinard of Striguil.
Sources
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | Wace, c. 1155
Brut | Layamon, late 12th century to mid-13th century