Mnaseas is reckoned to have been a pupil of a scholar who was chief librarian at what library?
Eratosthenes Eratosthenes of Cyrene ( ; Greek: Ἐρατοσθένης ὁ Κυρηναῖος , ] ;  – ) was a Greek mathematician, geographer, poet, astronomer, and music theorist. He was a man of learning, becoming the chief librarian at the Library of Alexandria. He invented the discipline of geography, including the terminology used today.
Themista of Lampsacus Themista of Lampsacus, the wife of Leonteus, was a student of Epicurus, early in the 3rd century BC. Epicurus' school was unusual in the 3rd century, in that it allowed women to attend, and we also hear of Leontion attending Epicurus' school around the same time. Cicero ridicules Epicurus for writing "countless volumes in praise of Themista," instead of more worthy men such as Miltiades, Themistocles or Epaminondas. Themista and Leonteus named their son Epicurus.