His brother, Archambaud VIII, inherited Bourbon, and William inherited Dampierre. He married Margaret II, Countess of Flanders and Hainault,[1] in 1223 and was thus regent of Flanders until his death as "Willem I" (or "Guillaume Ier"). In 1226 William and Margaret founded a Cistercian nunnery at Saint-Dizier.[2] Their sons William III and John continued to confirm and patronize the nunnery during their lives,[2] including William II's burial there in 1231.[2] William and Margaret founded more Cisterian nunneries throughout the county of Flanders, including Flines Abbey.[2]
Evergates, Theodore (2007). The Aristocracy in the County of Champagne, 1100-1300. University of Pennsylvania Press.
Lester, Anne E. (2011). Creating Cistercian Nuns: The Women's Religious Movement and Its Reform in Thirteenth Century Champagne. Cornell University Press.