Of these the Montgenèvre and the Brenner were the most frequented. In the Central Alps only two passes (the Splügen and the Septimer) were certainly known to the Romans. In fact the central portion of the Alps was by far the least Romanised region until the early Middle Ages. Thus the Simplon is first definitely mentioned in 1235, the St Gotthard in 1236, the Lukmanier in 965, the San Bernardino in 941; of course they may have been known before, but authentic history is silent as regards them till the dates specified. Even the Mont Cenis (from the 15th to the 19th century the favourite pass for travellers going from France to Italy) is first heard of only in 756.