The first two, silver denarii, I picked up last month at the Whitman Baltimore Coin Expo. The second two coins I picked up at the Catonsville Coin Club meeting this week with Preston. He snagged a number of Indian Head cents. :)

I already had a Constantine I coin, but this one was very reasonably priced ($20.00) and from a different mint, Lugdunum (current day Lyon).

So, working on getting a coin representing each Roman emperor. Will take some time.