If you mean, what were the foundational civilizations for classical Greece and Rome, then that would be the Mycenaeans and Etruscans, respectively. The Mycenaeans were seafaring conquerors who took over Crete from the Minoans and eventually the Peloponnesian peninsula. The Etruscans were the ruling group before the Romans. They were a monarchy that was overthrown by the Romans to form the republic. There is some debate as to who originally founded Rome, including the idea that some of the surviving Trojans migrated there from modern-day Turkey to found what would eventually become the Roman republic.