Gallia Cisalpina

Cisalpine Gaul (Gallia Cisalpina), also called Gallia Citerior or Gallia Togata, was the part of Italy inhabited by Celts (Gauls) during the 4th and 3rd centuries BC. Conquered by the Roman Republic in the 220s BC, it was a Roman province from c. 81 BC until 42 BC, when it was merged into Roman Italy. Until that time, it was considered part of Gaul, precisely that part of Gaul on the "hither side of the Alps" (from the perspective of the Romans), as opposed to Transalpine Gaul ("on the far side of the Alps").

Gallia Cisalpina was further subdivided into Gallia Cispadana and Gallia Transpadana, i.e. its portions south and north of the Po River, respectively. The Roman province of the 1st century BC was bounded on the north and west by the Alps, in the south as far as Placentia by the river Po, and then by the Apennines and the river Rubicon, and in the east by the Adriatic Sea. In 49 BC all inhabitants of Cisalpine Gaul received Roman citizenship, and eventually the province was divided among four of the eleven regions of Italy: Regio VIII Gallia Cispadana, Regio IX Liguria, Regio X Venetia et Histria and Regio XI Gallia Transpadana.

The Canegrate culture (13th century BC) may represent the first migratory wave of the proto-Celtic population from the northwest part of the Alps that, through the Alpine passes, penetrated and settled in the western Po valley between Lake Maggiore and Lake Como (Scamozzina culture). They brought a new funerary practice—cremation—which supplanted inhumation. It has also been proposed that a more ancient proto-Celtic presence can be traced back to the beginning of the Middle Bronze Age (XVI-XV century BC), when North Western Italy appears closely linked regarding the production of bronze artifacts, including ornaments, to the western groups of the Tumulus culture (Central Europe, 1600 BC - 1200 BC). The bearers of the Canegrate culture maintained its homogeneity for only a century, after which it melded with the Ligurian aboriginal populations and with this union gave rise to a new phase called the Golasecca culture, which is nowadays identified with the Celtic Lepontii.Livy (v. 34) has the Insubres, led by Bellovesus, arrive in northern Italy during the reign of Tarquinius Priscus (7th-6th century BC), occupying the area between Milan and Cremona. Milan (Mediolanum) itself is presumably a Gaulish foundation of the early 6th century BC, its name having a Celtic etymology of "[city] in the middle of the [Padanic] plain". Polybius in the 2nd century BC wrote about co-existence of the Celts in northern Italy with Etruscan nations in the period before the Sack of Rome in 390 BC.

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