There are two modern states that was called Roman Republic: one sister republic of France that existed from 1789 to 1799 and had a black-white-red tricolour, and the second one is a risorgimento-era republic that existed from 1849 to 1850 and had the flag below. All coins in the entry Italy > Italian States > Roman Republic have flag of the sister republic, even for the 19th century state.
