Read the books by Robert Harris.
Imperium
Conspirata/Lustrum
He's busy writing the third one due for release this year. Cicero owns in those books.
Imperium was great but Lustrum is one of the best books I've ever read!
Everything thing Cicero says in his speeches in those books are the actual speeches he used.
I love the Roman Republic, true freedom of speech!
Really looking forward to the next book!