What are the similarities between the upper class in Ancient Greece and the upper class in Ancient Rome

Both Greece and Rome were peninsulas. They both had plenty of mountains, they were both surrounded by sea(s) on three sides, and they both had a Mediterranean climate. But Rome had fertile soil on their Italian Peninsula, while the Greeks had poor soil on their Pelopennesus Peninsula.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.