Jean married Jeanne De Dammartin, [COMTESSE DE PON in May 1260. Jeanne (daughter of Simon Ii Count Dammartin, [COUNT OF AUMALE and Marie (Jeanne) Countess Ponthieu & Montr, UIL) was born about 1216 in Of, DAMMARTIN, Seine-et-Marne, France; died on 15 Mar 1279 in , Abbeville, Somme, France. [Group Sheet] [Family Chart]