Callimachus was the Housman of antiquity. He had formidable learning, combative pugnacity, and a rare capacity to put both aside and write with exquisite simplicity. His learning is seen in the traditions about his pupils, who were reputed to include Eratosthenes, Aristophanes of Byzantium, and Apollonius of Rhodes, with whom he was later on terms of enmity. It is seen in his association with the library at Alexandria. A scholiast to Plautus says that he held the post of librarian. That he was not chief librarian is proved by the list preserved in a papyrus at Oxyrhynchus, but there is no reason to doubt that he served on the library staff, especially as his published works included a library catalogue. It is to be seen in his later reputation: thus to Philippus Callimachus is the main weapon of the dry-as-dust army of commentators (AP 11. 321) and to study him is an investigation in the dark (AP 11. 347). It is seen in the volume of his works which numbered over eight hundred, and their general character. They show a taste for curious learning; one may instance a series on Local Nomenclature which included a book on Local Month-Names, or another on The Rivers of the World with separate volumes for Europe and Asia, or a volume on Foundations and Name-Changes of Islands and States, or Geographical Wonders of the World.