The Greatest Empire?

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The Mongol Empire(normal)

That's what I was thinking.

This

The Mongols had an indirect impact, but don't seem to have much of a lasting legacy. They conquered an enormous area, but they assimilated into the people they ruled, and none of their governments lasted too long.

Their legacy opened trade routes across the Eurasian landmass. That, in turn, led to heightened interest in European imperial exploration.

But out of these two, the British. To this day, its language and culture is the world's standard. IMO the Chinese Empire (in all its reincarnations until 1911) should be ranked higher than the Roman Empire simply for being far longer lasting, influencing more people to this day, and to some extent still being in existence.