In what year BC was the Roman Republic founded?

The date of the beginning of the existence of the Roman Republic is considered to be 509 BC.
The Roman Republic replaced the tsarist period. The last king was removed from power by conspirators, one of whom was, according to sources, the Roman Brutus.
It was during the Republic that the Romans began active expansion, first in Italy, and then in other countries.
The Roman Republic entered the world arena, gradually conquering new territories and entering into wars with various opponents, from the northern barbarians to Hannibal and the Parthians.