Serapeum of Alexandria in the context of "Serapis"

The Library of Alexandria in Alexandria, Egypt, was one of the largest and most significant libraries of the ancient world. The library was part of a larger research institution called the Mouseion, which was dedicated to the Muses, the nine goddesses of the arts. The idea of a universal library in Alexandria may have been proposed by Demetrius of Phalerum, an exiled Athenian statesman living in Alexandria, to Ptolemy I Soter, who may have established plans for the library, but the library itself was probably not built until the reign of his son Ptolemy II Philadelphus. The library quickly acquired many papyrus scrolls, owing largely to the Ptolemaic kings' aggressive and well-funded policies for procuring texts. It is unknown precisely how many scrolls were housed at any given time, but estimates range from 40,000 to 400,000 at its height.

Alexandria came to be regarded as the capital of knowledge and learning, in part because of the Great Library. Many important and influential scholars worked at the Library during the third and second centuries BC, including: Zenodotus of Ephesus, who worked towards standardizing the works of Homer; Callimachus, who wrote the Pinakes, sometimes considered the world's first library catalog; Apollonius of Rhodes, who composed the epic poem the Argonautica; Eratosthenes of Cyrene, who calculated the circumference of the earth within a few hundred kilometers of accuracy; Hero of Alexandria, who invented the first recorded steam engine; Aristophanes of Byzantium, who invented the system of Greek diacritics and was the first to divide poetic texts into lines; and Aristarchus of Samothrace, who produced the definitive texts of the Homeric poems as well as extensive commentaries on them. During the reign of Ptolemy III Euergetes, a daughter library was established in the Serapeum, a temple to the Greco-Egyptian god Serapis.

The Ptolemaic dynasty (/ˌtɒlɪˈmeɪ.ɪk/; Ancient Greek: Πτολεμαῖοι, Ptolemaioi), also known as the Lagid dynasty (Λαγίδαι, Lagidai; after Ptolemy I's father, Lagus), was a Macedonian Greek royal house which ruled the Ptolemaic Kingdom in Ancient Egypt during the Hellenistic period. Reigning for 275 years, the Ptolemaic was the longest and last dynasty of ancient Egypt from 305 BC until its incorporation into the Roman Republic in 30 BC.

Ptolemy, a general and one of the somatophylakes (bodyguard companions) of Alexander the Great, was appointed satrap of Egypt after Alexander's death in 323 BC. In 305 BC he declared himself Pharaoh Ptolemy I, later known as Sōter "Saviour". The Egyptians soon accepted the Ptolemies as the successors to the pharaohs of independent Egypt. The new dynasty showed respect to local traditions and adopted the Egyptian titles and iconography, while also preserving their own Greek language and culture. The Ptolemaic period was marked by the intense interactions and blending of the Greek and Egyptian cultures. Under the Ptolemies, Hellenistic religion was largely shaped by religious syncretism and imperial cult. Elements of Greek education became widespread in urban spaces, culminating in the foundation of the Mouseion (including the Library of Alexandria) and the Serapeum. During the Hellenistic period, the city of Alexandria, founded by Alexander the Great, would gradually surpass Athens as the intellectual centre of the Mediterranean world.

Pompey's Pillar (Arabic: عمود السواري, romanized: 'Amud El-Sawari) is a Roman triumphal column in Alexandria, Egypt. Despite its modern name, it was actually set up in honour of the Roman emperor Diocletian between 298–302 AD. The giant Corinthian column originally supported a colossal porphyry statue of the emperor in armour. It stands at the eastern side of the temenos of the Serapeum of Alexandria, which is now in ruins.

It is the only ancient monument in Alexandria that is still standing in its original location.

A serapeum is a temple or other religious institution dedicated to the syncretic Greco-Egyptian deity Serapis, who combined aspects of Osiris and Apis in a humanized form that was accepted by the Ptolemaic Greeks of Alexandria. There were several such religious centers, each of which was called a serapeion/serapeum (Ancient Greek: Σεραπεῖον) or poserapi (Ancient Greek: Ποσεραπι), coming from an Egyptian name for the temple of Osiris-Apis (Ancient Egyptian: pr-Wsỉr-Ḥp, lit. 'house of Osiris-Apis').