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.
Moses of Mardin Moses of Mardin (Latin: "Moses Mardenus") was a Syriac Orthodox priest and bishop who played a significant role in printing the first Syriac bible and served as perhaps the first Syriac teacher/scholar in Europe.