Marcianus of Heraclea

Marcian of Heraclea (, Markianòs Hērakleṓtēs; ; fl. century AD) was a minor Greek geographer from Heraclea Pontica in Late Antiquity.

His known works are:

Periplus of the Outer Sea (Greek: Περιπλοισ τησ εΞω Θαλασσησ ). It mentions places from the Atlantic ocean to China. An epitome of Artemidorus Ephesius: On the Distances of Cities from Rome. Only little survives of the epitomes, through citations in the work of Stephanus of Byzantium, but in the case of Menippus there is also some manuscript material. From it, it seems Marcian had not improved much upon Menippus.

The date of Marcian can only be inferred. He was earlier than Stephen of Byzantium, by whom he is quoted, and later than Ptolemy, upon whose work his own depends. Salmasius in his Exercitationes Plinianae placed him about the time of Synesius, who speaks of a Marcian in his "Epistola C" to the Heracleote rhetor Pylaemenes. But there is danger of error in assuming this to be the same Marcian. Müller places him about A.D.400.