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.
Coriscus of Scepsis Coriscus of Scepsis ( ; Greek: Κορίσκος Σκήψιος ) and his brother Erastus were students of Plato. He was also a friend of Aristotle. Coriscus' son Neleus is mentioned as inheriting Aristotle's library.