Answer:
The Roman Empire
Explanation:
The Roman Empire is the Ancient Empire that left the greatest influence. Its influence can be still felt to this day in every aspect of life, and in the whole world.
For example, the Romance Language, which stem from Latin (the language of the Roman Empire), and include Spanish, Portuguese, French, Italian and Romanian, are spoken today by over 700 million people in th whole world.
The Roman Empire was also the Empire that not only legalized Christianity, but also made it the official religion. Nowadays, there are 2.4 billion Christians in the world, around 30% of the world's population.
Finally, the Roman Empire also left influences in engineering, law, literature, theater, philosophy, and even, military strategy. The story of the Roman Empire continues fascinate historians to this day, and new details are discovered every year.