Epistrod, Epistrophius
The King of Greece who was subservient to the Roman Procurator Lucius, and was called upon to join Lucius in the war against Arthur.
Sources
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | Wace, c. 1155
Brut | Layamon, late 12th century to mid-13th century