On the foundation of Megalopolis, in 371 BC, the inhabitants of Trapezus refused to remove to the new city; and having thus incurred the anger of the other Arcadians, they quitted Peloponnesus, and took refuge in Trapezus on the Pontus Euxeinus (modern Trabzon), where they were received as a kindred people.
The founding of Megalopolis in 371 BC led to a mass migration of people from Trapezus, who refused to relocate to the new city and instead left Peloponnesus, seeking safety in Trapezus on the Pontus Euxeinus (modern Trabzon), where they were warmly welcomed as fellow citizens.