Joanna I of Naples
Humbert's wife died around the start of 1347, shortly before he returned from the crusade. As he was returning, he joined marquesses John II of Montferrat and Thomas II of Saluzzo in their fight against Robert's successor, Queen Joanna I of Naples, who was supported by the Savoyards. When Pope Clement VI brought the two sides to negotiations, the terms included the possibility of Humbert marrying Bianca of Savoy, though this did not reach agreement.