The Tor di Nona— now a small area in Rome's Rione V called "Ponte", which lies in the heart of the city's historic center, between the via dei Coronari and the Tiber— commemorates a mediaeval tower which stood there. As the Torre dell'Annona it was a medieval stronghold of the Orsini and from the early 15th century, acted as a pontifical prison. Prisoners included Benevenuto Cellini who experienced the dungeon's lightless cells, one of which was known as "the pit", and Giordano Bruno who was imprisoned here before being burned alive in Campo de' Fiori.