MARK ZUCKERBERG, ELON MUSK

Italians would riot in the streets if Rome's Colosseum staged a UFC fight between Elon Musk and Mark Zuckerberg ... that's the prediction from a famed archaeologist over in Italy.

Darius Arya, a historian whose been on tons of TV programs about Ancient Rome, joined us on "TMZ Live" Friday from Italy's capital and we asked him about the Italian government contacting Zuckerberg about hosting his fight with Elon.

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For Darius, the prospect of the billionaires doing battle at the same site as the ancient gladiators of old sounds super enticing ... telling us the Colosseum would come out on top of a list of potential venues, mainly because of its international fame as the ultimate arena of the…