Beatrice of Montferrat

Beatrice of Montferrat (c. 1210–1274) was the eldest daughter of William VI, Marquess of Montferrat, and younger sister of Boniface II. In 1219, aged about nine, she married Guigues VI of Viennois, more than twenty years her senior.

When Guigues died in March 1237 she became regent for their young son Guigues VII, guiding his reign until 1243. The troubadour Gauseran de Saint-Leidier made her the idealised lady of his love songs.