Italia in The 3rd Century
When Roman citizenship was given to all the Empire (in the year 212), Italia began to decline in favour of the provinces. Furthermore, Italian territory suffered from the attacks of barbarian tribes, which happened at the end of the 3rd century (see Crisis of the third century and Barracks emperors).
Diocletian divided the Empire into four parts and several dioceses, the so-called Tetrarchy. The diocesis Italiae, under the rule of the Augustus of the West, was divided into two zones, each divided into smaller territories held by correctores:
- Italia suburbicaria ("under the government of Rome")
- Tuscia et Umbria
- Valeria
- Campania et Samnium
- Apulia et Calabria
- Sicilia
- Sardinia et Corsica
- Italia annonaria, with capital Mediolanum (Milan)
- Venetia et Histria
- Aemilia et Liguria
- Flaminia et Picenum
- Raetia
- Alpes Cottiae
The former Italian regions of Alpes Poenninae and Alpes Maritimae become part of the Diocesis Galliarum.
Read more about this topic: Italy (Roman Empire)
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—Henry Brooks Adams (1838–1918)