I Rioni di Roma

The word rione (pl. rioni) comes from the Latin regio (pl. regiones, meaning region); during the Middle Ages the Latin word became rejones, from which rione. The word has been used since the Middle Ages to name the districts of central Rome, according to the political divisions of that time.

The rioni were established for the first time in the 4th century BC by Servius Tullius: they were only four and they were called regiones (the plural of regio).

Then, during the Imperial ages, Augustus increased their number to 14: all but Transtiberim (the modern Trastevere) were on the east side of the river Tiber. They were (see 14 regions of the Augustan Rome):

Porta Capena

Caelimontium

Isis et Serapis

Templum Pacis

Esquiliae

Alta Semita

Via Lata

Forum Romanum

Circus Flaminius

Palatium

Circus Maximus

Piscina Publica

Aventinus

Transtiberim

Rome became the capital of the new born Italy. The needs of the new capital caused a great urbanization 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 Aurelian walls.

The latest reform, which is still mostly valid, was made in 1972: Rome was divided in 20 circoscrizioni (later renamed municipi, one of which has since become an independent municipality) and all the 22 rioni (thus the historical center) were placed in the first one, Municipio I.

The complete list of the modern rioni, in order of number, is the following:

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