The aim of the new Norman kings was to strengthen the "Latin stock", which in Sicily was a minority, compared to the more numerous Greek populations.

Beginning from the end of the 11th century were repopulated the central and eastern parts of the island, the Val Demone, where there was a strong Byzantine presence and the Val di Noto, with colonists and soldiers from the Aleramici mark which included the Monferrato in Piedmont, part of the Ligurian hinterland of the west, and small portions of the western areas of Lombardy and Emilia.

[5] The major centres, called historically oppida Lombardorum, where these dialects can still be heard today, include Piazza Armerina, Aidone, Sperlinga, San Fratello, Nicosia, and Novara di Sicilia.

Northern Italian dialects did not survive in some towns in the province of Catania, Syracuse and Caltanissetta that developed large Lombard communities during this period, for example Paternò and Butera.

In the case of San Fratello, some linguists have suggested that the Gallic-Italic dialect present today has Provençal as its basis, having been a fort manned by Provençal mercenaries in the early decades of the Norman conquest (bearing in mind that it took the Normans 30 years to conquer the whole of the island).