The Roman Republic was the subject of an In Our Time episode all the way back in 2004 - we listened to it last August while there weren't any new In Our Times airing. It's a pretty broad subject for a 45 minute programme - 500 years of history plus its rise and fall - so of necessity it was painting with fairly broad brushstrokes and looking at themes and commonalities across the centuries. Tackling it were Greg Woolf (St Andrews University), Catherine Steel (University of Glasgow) and Tom Holland (historian and author).
1st Millennium BCE
The Etruscans were one of the other cultures to live in Italy in the 1st Millenium BCE. They are often overlooked in favour of the Romans (who conquered them), but they were a power in their day and even ruled over Rome for a while early in its history. They were the subject of an In Our Time episode from 2011 which we listened to recently, and discussing Etruscan history and culture were Phil Perkins (Open University), David Ridgway (University of London) and Corinna Riva (University College London).