events that happend in acient rome around 509 b.c.e to 27 b.c.e?

Answer 1

1st, 2nd & 3rd Punic War.
Julius Caesar crossed the Rubicon, leading to civil war with Pompeii
2nd triumvirate ended with Augustus' victory over Marcus Antonius
Great fire of Rome
2 Roman legions annihilated in the Black Forest

Answer 2

First, you're wrong about 509 BC as the start of the republic. The date was shifted to synchronise with the start of Athenian democracy. The true date was 503 BC. The sack by the Gauls was 386 BC and not 390 BC.

Answer 3

Julius beat the Gauls and crossed the Rubicon, Carthage defeated. Lord there is a ton of History there.