Visc. Guillaume I of Thiers 
Guillaume I of Thiers' father was Visc. Gui II of Thiers and his mother was Reclinde. His paternal grandparents were Visc. Etienne I of Thiers and Ermengarde. He was an only child. He died in 1048.General Notes
pg. 80, "The Plantagenet Ancestry" by W.C. Turton, published 1928
They had a son named Etienne II of Thiers.
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