I think more the Roman history. From my impression the greek lost their influence due to excessive infighting. The Roman history hits much closer to the heart o

I think more the Roman history. From my impression the greek lost their influence due to excessive infighting. The Roman history hits much closer to the heart of the issue, likely Volume V of V "History of the Roman Republic" and you can see the Chapter Title "End of the Republic" shining through the pages already. In the end, all those that learn history are doomed to watch history repeat itself.