The conflict with Erard and Philippa broke into open warfare in 1215 as the Champagne War of Succession, and was not resolved until after Theobald came of age in 1222.
Sukob s Erardom i Philippom izrastao je otvoreni rat godine 1215. kao Rat za šampanjsko naslijeđe, a nije riješen dok Theobald nije postao punoljetan godine 1222.