In the movie Gladiator (2000) whats the reason for statues of people (probably emperors) being everywhere?

I was watching Gladiator more focused than ever, and I realized there´s statues in the background in a lot of scenes. Is there a historical reason for this? what´s the meaning?

In the movie Gladiator (2000) whats the reason for statues of people (probably emperors) being everywhere?
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