In the Ancient Near East, Babylon had a central role: it was both conqueror and conquered. It lay at a crucial location on the Euphrates River, where the river had been divided into a number of trenches and canals which flowed through and around the city both to provide water, mainly for agricultural irrigation, and to provide defense in a system of moats.
The Tigris River was not far from Babylon, and together the Tigris and Euphrates gave the region both moisture for crops as well as transportation in the forms of ships and barges which moved up and down the waterways.
The earliest written documentation of the city seems to be from around 2250 B.C., and the cities importance waxed and waned: during its highpoints, the city was the political center of the Babylonian Empire; during its low points, it was a vassal to other empires.
The word ‘Babylonia’ refers to the larger region controlled by the city of Babylon, i.e., the Babylonian Empire.
During one of its last glory days, Babylonia conquered Israel and brought most of that nation’s citizens to Babylon as slaves: this would have happened approximately during the time from 598 B.C. to 586 B.C.
The military defenses of the city were formidable. The captured slaves would have been impressed, and probably depressed, by the structures of the city, as described by historians Joachim Marzahn & Klaudia Englund:
Babylon was situated on both sides of the Euphrates, the old town to the east, another half of the town to the west of the river. It was protected by a double ring of walls, the inner wall being some 6.5, and the outer wall 3.5 meters thick. At distances of 17-18 meters, towers of, respectively, 11 and 4.5 meters width formed part of the defenses. At least 8 double gateways stretching 50 meters afforded entrance to the city. The old town alone comprised an area of ca. 2¼ km2, a large part of which was occupied by palaces and temples. Further protection was offered by the eastern wall spanning some 8 km, which also protected buildings beyond the inner city, for example, the Summer Palace in the north.
This system of walls and gates was not only a military defense system, but rather also an impressive work of art and architecture. The famous Ishtar Gates featured bricks with a glossy blue glazed finish. Accents of gold or yellow were mainly in the form of lions.
Beneath the walls and gates, the foundations extended downward even further than the walls above ground extended skyward: This was to prevent an attacking army from tunneling under the walls.
The physical strength and architectural grandeur of the walls of Babylon was paired with the intellectual resources of the city, which was a center of both literary and scientific work.
In 539 B.C., Cyrus of Persia conquered the city with little actual fighting: the city seems to have surrendered quickly. Babylon was incorporated into the Persian Empire, but retained some importance as a regional administrative and cultural center.
Cyrus died around 529 B.C., and various kings succeeded him as rulers of Persia. One of those later kings was Xerxes.
In 482 B.C., the city revolted against Xerxes. He put down the rebellion and, as historian Henry W.F. Saggs writes, the uprising
led to destruction of its fortifications and temples and to the melting down of the golden image of Marduk.
(Marduk was a major figure in the Babylonian polytheistic system.)
Although the city remained in existence for several centuries after this, it was never again a major player in the politics of the Ancient Near East.