In the 4th century BC, Alexander, the Macedonian king in northern Greece, conquered Egypt and established Alexandria on the Mediterranean coast of the Nile Delta. During the Ptolemy period, the city became the largest city in the whole Mediterranean region, and it was also the economic and cultural exchange center between the Mediterranean region and the eastern countries. The largest library in ancient times was Alexandra Library, which was built by three generations of grandparents in Ptolemy I Soter in the 4th and 3rd centuries BC. At that time, at the peak of Ptolemy dynasty, scholars from all over the world gathered in Alexandria. Kings of past dynasties were very keen on collecting books, which led to the collection of 700 thousand books in Alexandria Library. Successive curators are all famous scholars. The collection includes not only almost all the important documents of Greece, but also the documents of pagans such as the Mediterranean, the Middle and Near East, and ancient India, which embodies the academic style of advocating freedom in Alexandria. In the 3rd century BC, Pinax edited by Cali Marcos, the curator of the museum, was a list of masterpieces (existing fragments) with a volume of 120. For more than 200 years, the museum has been the literature center of Greek culture.