 Complete the following phrase:  Archaeological findings have proved the presence of Celtic settlements in the pre-Roman age. After the fall of the Western Roman Empire, in the Middle Ages it was owned by the Novalesa Abbey and then by the prevosts of Oulx. From 1000, it was part of the Dauphiné and then of the Escartons Republic until 1343; with the Treaty of Utrecht 1713 France gave it to the House of Savoy; in 1747 its territory was the seat of the 