Though the power of the Empire was seated in Rome the greatest unifying force of the Empire was its foundations, which were built on the conquests of Alexander the Great. It was the Hellenistic Empire which established a unified civilization of the Mediterranean and Greater Middle East, parts of Africa, India and southern Europe. With its conquests of the Mediterranean including Egypt and Babylon, that Rome inherited by its absorption of the Hellenistic Empire. The unity was based on the implementation of common or Koine Greek as the language of the Empire. It was this language that the earliest Christians' text were written in.