What ancient ruler destroys the Babylonians?

Answer 1

Babylon is destroyed and rebuilt many times between 18th century BC and 6th century BC, the final time it was destroyed in the 3rd century BC, it's directly related to the Greek conquest of the area. In 312 BC Seleucus founds a new Mesopotamian capital city, Seleucia, further to the north and on the Tigris rather than the Euphrates. Much of the building material is brought from Babylon, which becomes a forgotten city until excavated in the 20th century.