This series takes a historical look at the ancient world's leading figures, who led armies to victory and ruled over vast domains in a time when the world was still young. As one empire fell, another would rise, led by charismatic and powerful commanders who could unite many people and were touched by greatness. This king of the Franks was one of the few Western rulers to be declared Holy Roman Emperor. Charlemagne was successful in uniting the disparate tribes of Western Europe in the name of Christianity.