Original: It survived the overthrow of the kings in 509 BC , the fall of the Roman Republic in the 1st century BC , the split of the Roman Empire in 395 AD , and the fall of the Western Roman Empire in 476 AD .
Simplified: It survived the kings , the Roman Republic ( 509 BC -- 27 BC ) , the Roman Empire ( 27 BC -- 395 AD and the fall of the Western Roman Empire ( 395 -- 476 AD ) .