SAINT AMBROSE (c. 340-397), bishop of Milan, one of the most eminent fathers of the church in the 4th century, was a citizen of Rome, born about 337-340 in Treves, where his father was prefect of Gallia Narbonensis.
The ancient territorial divisions Belgium, Gallia Lugdunensis (Lyonnaise), Gallia Narbonensis (Narbonnaise)were split up into seventeen little provinces, which in their turn were divided into two dioceses.
Probably towards the end of the same year he brought forward the law (lex Pompeia de Gallia Transpadana), which conferred upon the inhabitants of that region the privileges granted to the Latin colonies.
Avignon (Avenio) was an important town of the Gallic tribe of the Cavares, and under the Romans one of the leading cities of Gallia Narbonensis.
It became a Roman municipium, with the rest of Gallia Transpadana; but'lvIartial calls it little Mantua, and had it not been for Virgil's interest in his native place, and in the expulsion of a number of the Mantuans (and among them the poet himself) from their lands in favour of Octavian's soldiers, we should probably have heard almost nothing of its existence.