Banners of the districts (rioni) of central Rome, from the facade of Palazzo Senatorio, 15th century. The rioni of Rome were originally established by King Servius Tullus in the 4th century BC. The Emperor Augustus increased their number to 14. From left to right the banners are of: rione X Campitelli; rione XI Sant' Angelo; rione XII Ripa; rione XIII Trastevere.