The ancient Empire that flourished here from 2500 b.c. until just before the dawn of Christianity was, arguably, the greatest civilization that the world has ever seen.
The civilization of the Greeks was debatably the greatest on Earth.
mnli hypothesis: The civilization of the Greeks was debatably the greatest on Earth. premise: The ancient Empire that flourished here from 2500 b.c. until just before the dawn of Christianity was, arguably, the greatest civilization that the world has ever seen.