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Humbert I of Viennois (c. 1240 – 12 April 1307) was baron of la Tour-du-Pin and then also became, by his marriage, dauphin of Viennois. He was the son of Albert III, baron of la Tour-du-Pin, and of Béatrice de Coligny[1] (herself the daughter of Hugh I, lord of Coligny and of Béatrice d'Albon, dauphine of Viennois).
In 1294, Humbert became a vassal of King Philip IV of France in exchange for £500 annual pension, which would give impetus to the acquisition of the Dauphiné, by King Philip VI of France, fifty years later.[2]
Cox, Eugene L. (1974). The Eagles of Savoy: The House of Savoy in Thirteenth-Century Europe. Princeton University Press.
Cox, Eugene (1999). "The Kingdom of Burgundy, the lands of the house of Savoy and adjacent territories". In Abulafia, David; McKitterick, Rosamond (eds.). The New Cambridge Medieval History. Vol. 5, C.1198–c.1300. Cambridge University Press.