First cited in the mid sixteenth century. When King Carlo Emanuele III decided to valorize the Valdieri hot springs, in 1755, a building and other appurtenances were quickly built in order to create a spa around the sulfurous waters. Cavour called Valdieri "the richest in health-preserving waters in all the nation, and perhaps in all of Europe as well". Vittorio Emanuele II, who first visited Val Gesso in 1855, became a frequent guest at the spa, and it was at his behest that, on 10 July 1857, the first stone was laid for the structure that was to become the Hotel Royal.