Who was stronger? Roman Empire or Holy Roman Empire or TODD's Unholy Roman Empire?

Question

The last empire is a fictional novel empire, not unlike Genesis.

Answer 1

1. Well we can disregard the one that never existed, and be left with two.

2. It's the Roman Empire - it was larger, it had a well-organised, disciplined army, and a political structure that enabled control to be exercised from Rome. The Holy Roman Empire was just a loose, religious confederation of various territories with their own rulers.