The Islands of Andaman wrote:
I agree, it took the Allies 8 Coalitions of at least 4 nations per coalition 17 years to defeat Napoleon. That was a little one-sided.
And even then he had to invade Russia to get his ass kicked. If Napoleon didn't invade Russia, French would be the language of the day.
I'd say the Empire with the greatest potential was the Franco-Russia alliance. No one would mess with that shit. Also possible if the US and USSR allied after WWII.
As for top five (in chronological order):
Roman Empire
Mongol Empire
Chinese Empire
Russian Empire
Napoleonic Empire
What?! No British?! Nope. Sorry, I believe that you actually have to win wars against real opponents, not those Zulus hurling spears at ya, or the Native Americans with arrows, or send your criminals with guns to a faraway place. Let's not forget that the British lost Normandy to the French in the 100 Years' War...
Also no Alexander of Macedon because you have to last a bit to become an empire.