Agathemerus

Agathemerus was a Greek geographer who during the Roman Greece period published a small two-part geographical work titled A Sketch of Geography in Epitome, addressed to his pupil Philon. The son of Orthon, Agathemerus is speculated to have lived in the 3rd century. Although little is known about Agathemerus historically, he lived after Ptolemy, whom he often quotes, and before the formation of Constantinople on the site of Byzantium by Constantine the Great in 328 AD, as he only refers to the city as Byzantium. From his speaking of Albion ἐν ᾗ στρατόπεδα ἵδρυται, it has been thought that he wrote not very long after the erection of the Wall of Severus. This is probably true, but the language is scarcely definite enough to establish the point.