Usually characters from ancient Rome are portrayed by Brits. But after reading about Sulla because of his mention on 'The Riches', and looking at statues of him at the Wikipedia site, I'm thinking John C. McGinley might be the right actor to play him in Toobworld.
What threw it in his favor? Sulla had red hair. McGinley wouldn't need to spend much time in the hairdresser's chair. (Once he lets it grow back, of course.)
Actually Mark Lenard would have been a better choice, but it's a little late for that now.....
At any rate, here's another good example of Television leading to a further expansion of my personal education. I never heard of Sulla before the reference of 'The Riches'.