Visc. Gui II of Thiers 
Gui II of Thiers' father was Visc. Etienne I of Thiers and his mother was Ermengarde. His paternal grandfather was Matfroi of Auvergne. He was an only child. He died in 1031.General Notes
pg. 80, "The Plantagenet Ancestry" by W.C. Turton, published 1928
They had a son named Guillaume I of Thiers.
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