Mnaseas of Patrae was a Greek historian of the late 3rd century BCE, who is reckoned to have been a pupil of Eratosthenes

Eratosthenes

Eratosthenes of Cyrene was a Greek mathematician, poet, athlete, geographer, astronomer, and music theorist.He was the first person to use the word "geography" and invented the discipline of geography as we understand it...

. His Periegesis or Periplus

Periplus

Periplus is the Latinization of an ancient Greek word, περίπλους , literally "a sailing-around." Both segments, peri- and -plous, were independently productive: the ancient Greek speaker understood the word in its literal sense; however, it developed a few specialized meanings, one of which became...

described Europe, Western Asia and North Africa, but whether in six or eight books cannot now be determined. His On Oracles appears to have consisted of a catalogue of oracular responses with commentary. Only fragments of his work survive, embedded as scholia or as quotations in other works, often selected, apparently, because of the unusual interpretations they offer.