Some historical sources, such as John of Nikiu, report that a fortress named Babylon was first founded by
Nebuchadnezzar II circa 568 BC, at the site where an
ancient Egyptian canal linked the Nile with the Red Sea. During an uprising, Babylonian prisoners established a stronghold between Memphis and
Heliopolis, on an elevation on the east bank of the Nile. The canal was re-dug by the
Persian king
Darius (r. 521–486 BC). The fortress's origins are often associated with Trajan (r. 98–117), who created the
Amnis Traianus, a reconstruction of the Red Sea canal that had fallen out of use. Trajan reportedly moved the mouth of the canal further south from its former location, to the site of what is now Old Cairo, where he also constructed a fortified harbor. The construction of the present Babylon Fortress (whose remains are visible today) has been attributed by more recent archeological research to the reign of
Diocletian (r. 285–305), who expanded the fortifications at the mouth of the canal around 300 AD. The large new fortress, probably made necessary after the
Crisis of the Third Century, provided a considerable defense for both the land and sea routes in the region. The canal passed between two massive round towers and ran through the middle of the fortress. In later centuries, a wall was built between the two large towers to block the canal. stands today The town was the seat of a
Christian bishopric, a
suffragan of
Leontopolis, the capital and
metropolitan see of the
Roman province of
Augustamnica Secunda. The names of several of its bishops are recorded. After the
Council of Chalcedon (451), some are of those who
accepted the council, but most are of those who rejected it. No longer a residential bishopric, Babylon is today listed by both the
Eastern Orthodox Church and the
Catholic Church as a
titular see. During the
Eastern Roman Empire period the city revolted against the rule of its emperor,
Phocas. During the
Arab conquest of Egypt the Byzantine fortress held out for about seven months before finally
falling in December 640 to the Arab general
'Amr ibn al-'As. The history of this conquest, and of the subsequent rule of the then still
Coptic Christian city by the Arabs, is told by
John Bishop of Nikiû in his
Chronicle, which survives now only in
Ethiopic manuscripts. ==References==