Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Oulx is a comune in the Province of Turin in the Italian region Piedmont, located about 70 km west of Turin, in the Susa Valley on the border with France. Like many other towns in the Susa Valley, Oulx has different names reflecting the area's multiple linguistic traditions. One theory of the name's origin is that it derives from Ulkos, the name of a leader of the Celtic Salassi tribe. Another theory holds that the derivation is from Ultor, a title of the god Mars, to whom a temple in the area was dedicated. These names were first rendered as Ulces, and later Ulcium on maps in the Middle Ages, in Latin.