Following this, King Louis VI of France, married to Amadeus' sister Adélaide de Maurienne, attempted to confiscate Savoy.

Amadeus was saved by the intercession of Peter the Hermit, and by his promise to participate in Louis' planned crusade.

Amadeus travelled south through Italy to Brindisi, where he crossed over to Durazzo, and marched east along the Via Egnatia to meet Louis at Constantinople in late 1147.

Marching on to Adalia, Louis, Amadeus, and other barons decided to continue to Antioch by ship.

In Savoy, his son Humbert III succeeded him, under the regency of bishop Amadeus of Lausanne.