Boso is a Frankish nobleman from the Bosonid-family, who is related to the Carolingian dynasty,who rises to become King of Provence (879–887).
Boso is the son of Bivin of Gorze, a count in Lotharingia.
His aunt Theutberga was the wife of king Lothair II of Lotharingia.
Boso is also a nephew of the Italian count Boso, for whom he was named, and of Hucbert, lay abbot of Saint Maurice d’Agaune, to which he succeeds as lay abbot in 869.
