By the way ActRaiser, 16 other empires beat out the Romans in terms of size. This is according to Wikipedia.

[url=http://en.wikipedia.org/wiki/Largest_empires]

In case you can't access Wikipedia for whichever reason, that's the Brits, Mongols, Russians, Spanish, Umayyads, Qing, Yuan, French, Abbasids, Portuguese, Rashiduns, Brazilians, Achaemenids, Japanese, and Sassanids. The Ming and Han Dynasties are tied with the Romans, apparently.