The church of St. Sergio (also known as St. Sergius or Abu Serga) was built in the center of the Ancient Roman fort of Babylon. It is one of the sites visited by the Holy Family during their escape from King Herod to the land of Egypt.

The church likely dates back to the 5th Century, although some historians believe that it was actually built in the 8th Century.

The origin of Saint Sergius is uncertain, but there are two saints with the same name. The first one was an Egyptian who died during the intense Christian persecution, along with his father and sister. People today celebrate his memory every year on the 7th of February. The second one was a servant of the Roman Emperor Maximilian, and he was martyred in Syria at the beginning of the 4th Century.

The church’s shape is that of a basilica with a narthex, a nave, and 2 aisles. They are separated from the nave by 12 columns with Corinthian capitals, 10 of stone, one of marble and one of rosette granite.

One of the most important locations in this church is the cave in which the Holy Family stayed during their journey into Egypt. It has a nave and 2 aisles and the ceiling is domed. At the end of the southern aisle of the Cave, is a baptistery.