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> Teotihuacan, the largest city in the Western Hemisphere at the time Jesus walked on the Earth. It was 20 square kilometers whereas Rome at the height of the empire had only 14 square kilometers within the Aurelian Walls.

...so what? Why would you compare "the size of Teotihuacan" to "the area enclosed in the Aurelian Walls"? Why not compare it to "the size of Rome"?

I can think of one reason you'd do this...

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Huh?

Not the OP, but I have heard that Rome is defined by the seven hills, so I thought the Aurelian Wall definition was excluding a hill or something. The Wikipedia article says the walls cover all seven hills and the Campus Martius: https://en.wikipedia.org/wiki/Aurelian_Walls

Are you saying you'd include even more in "the size of Rome (the city)"? If so, what?

There were some people living outside that perimeter, but I just included the Seven Hills and the Campus Martius because it was a typical border for the city and was densely packed with maybe a million people. Teotihuacan possibly had up to 200,000 people, so a bit more breathing room.

You'd include the entire city. That's what people will take you to mean when you refer to a city.

And the OP did.

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