 Riva Valdobbia was a seasonal pasture area in the summer from ancient time and vaguely named "Pietre Gemelle", the Twin Stones, as the main landmark of the plain are two blocks, still there at the north end of Riva.The settlement became permanent and finally was detached from Scopa administration to form an independent parish in 1326, dedicated to Saint Micheal.In that century, the first Walser colonizations took place