Humbert I of Viennois

Humbert I (c.1240–1307), baron of La Tour-du-Pin, married Anne, daughter of Dauphin Guigues VII, in 1273, and from 1282 ruled the Dauphiné of Viennois in her right.

The union cut the Savoyard lands in two and brought war with Count Philip I of Savoy. He later ambushed and routed Amadeus V near Barraux.

In 1294 he became a vassal of King Philip IV of France in exchange for an annual pension, preparing the later French annexation of the Dauphiné. He died in April 1307, leaving the Dauphiné to his son John II.