Was the Roman empire the biggest empire?

The Colosseum at Rome was the biggest amphitheater in the empire.

The biggest amphitheater in the Roman empire was the Colosseum.

117 ad

No. It was not even close. the top is (depending on the definition and source) the british empire or the mongolian empire. rome was huge in the area, but not nearly as huge as these two. It was as...

no the British empire was it took over 1/4 of the world