Rome is also divided into differing types of non-administrative divisions. The historic centre is divided into 22 rioni, all of which are located within the Aurelian Walls except Prati and Borgo.
The Rioni have changed in number throughout history, from ancient Rome, the medieval period, to the Renaissance. They were later organized in a more precise way by Pope Benedict XIV in 1743.
Even after Napoleon I lost his power in the city, there were no sensible changes in the organisation of the city, until Rome became the capital of the new born Italy. The needs of the new capital caused a great urbanisation and an increase of the population, both within the Aurelian walls and outside them. In 1874 the rioni became 15 adding Esquilino, obtained taking a part from Monti. At the beginning of the 20th century some rioni started being split up and the first parts outside the Aurelian walls started being considered part of the city.
In 1921 the number of the rioni increased to 22. Prati was the last rione to be established. and the only one outside the City Walls.
With the creation of the circoscrizioni (later renamed municipi) in 1972, all the rioni, except Borgo and Prati, have been placed in the first one, Municipio I, which so contains almost completely the Centro Storico.
The complete list of the modern rioni, in order of number, is the following:
Piazza Navona, part of Parione.
Monti
Trevi
Colonna
Campo Marzio
Ponte
Parione
Regola
Sant'Eustachio
Pigna
Campitelli
Sant'Angelo
Ripa
Trastevere
Borgo
Esquilino
Ludovisi
Sallustiano
Castro Pretorio
Celio
Testaccio
San Saba
Prati
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