1. | Guillaume I Comte Sancerre was born Abt 1159, , France; died 1218. Guillaume married Eustachia De Courtenay Abt 1210. Eustachia (daughter of Pierre Emperor Of Constantinople, Prince of France and Isabelle Elizabeth De Courtenay) was born Abt 1161, Of, Courtenay, Galinois, France; died Aft 1234. [Group Sheet] |