This detailed answer provides information on the language of ancient Romans, the period in which Rome was under Etruscan influence, and the group that arrived in the Italian peninsula in the 8th century BCE.
The main language of the ancient Romans was Latin, not Italian or any of the other options presented.
Rome was initially a small city under Etruscan influence during the period of Monarchy.
The ancient group that arrived in the Italian peninsula around the 8th century BCE and expanded northward were the Etruscans.
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