Agathemerus

Agathemerus is a shadowy figure, probably active in the second century AD, known only as the author of a brief geographical compendium — the Geographiae Informatio (or Hypotyposis Geographiae). The work is a concise summary of ancient geographical knowledge: the division of the earth into continents, the dimensions of seas and land masses, and the names and locations of major geographical features. It draws heavily on Eratosthenes, Posidonius, and other earlier geographers.

Nothing else is known about his life. The treatise survives because it was useful — a school text or reference work that later copyists preserved for its practical value rather than its literary merit.