There were several librarians of the library at Pergamum, but the most famous one was probably Apollonius of Rhodes, who served as the head librarian in the 2nd century BC. Apollonius was a Greek scholar and poet who is best known for his epic poem the “Argonautica,” which tells the story of Jason and the Argonauts’ quest for the Golden Fleece. He is thought to have been a highly skilled librarian and to have played a key role in organizing and expanding the collection of the library at Pergamum.