The Serapeum was built during the reign of Ptolemy III Euergetes (246–221 BCE), on a hill to the west of the city just outside the ancient Ptolemaic city boundary, in what is today Kom El Shogafa district.
In the late first century CE, the Serapeum was largely destroyed by fire, and during the Roman era a larger temple was built on the same site. The Alex Med scale model is a reconstruction of the Serapeum built under the Romans. Archeological evidence shows that it had a large colonnaded courtyard, and in 289 CE, Diocletian's column was erected within this courtyard to commemorate Diocletian’s victory over an Egyptian rebellion.
Other features included underground passages and a sister library to the Library of Alexandria. In 391 CE, the Serapeum was destroyed two years after Emperor Theodosius had ordered the closure of all pagan temples throughout the Roman Empire. Today, the only element which remains standing intact is Diocletian’s column, erroneously referred to as Pompey's Pillar.Around the Roman Amphitheatre in Alexandria are some statues and columns’ capitals, dating back to the Roman era in Egypt.
Pompey's Pillar (column)
The name of Pompey pillar in relation to the pillar was used by many European writers in early modern times. The name is considered to stem from a historical misreading of the Greek dedicatory inscription on the base; the name ΠΟΥΠΛΙΟΣ (Πού̣π̣[λιος], Pouplios) was confused with ΠΟΜΠΗΙΟΣ (Ancient Greek: Πομπήιος, romanized: Pompeios)