▁while ▁much ▁of ▁Germany ▁recogn ised ▁Frederick . ▁Im medi ately ▁after ▁the ▁battle , ▁in ▁which ▁Philip ▁had ▁captured ▁Ferdinand , ▁Count ▁of ▁Fland ers , ▁Jean ▁was ▁one ▁of ▁three ▁b ish ops ▁asked ▁by ▁his ▁wife ▁Joan , ▁Count ess ▁of ▁Fland ers , ▁to ▁negoti ate ▁the ▁prisoner ' s ▁r ans om ▁and ▁release , ▁but ▁without ▁success . ▁ ▁Jean ▁was ▁obliged ▁to ▁wa ive ▁his ▁loyal ty ▁to ▁Otto ▁and ▁to ▁accept ▁the ▁authority ▁of ▁Frederick , ▁swe aring ▁him ▁f idel ity ▁and ▁obtain ing ▁a ▁re - gr ant ▁of ▁the ▁reg al ities ▁from ▁his ▁hands . ▁In ▁ 1 2 1 5 , ▁Frederick ▁granted ▁Jean ▁a ▁new ▁char ter ▁in ▁which ▁he ▁recogn ised ▁him ▁as ▁a ▁prince ▁of ▁the ▁Empire ▁and ▁as ▁a ▁k ins man . ▁ ▁In ▁ 1 2 1 2 , ▁on ▁the ▁death ▁of ▁his ▁brother ▁Bald win ▁without ▁a ▁surv iving ▁son , ▁he ▁had ▁inherited ▁the ▁lord ship ▁of ▁Ch oc ques ▁near ▁Bé th une . ▁Early ▁in ▁ 1 2 1 9 , ▁he ▁joined ▁the ▁Al big ens ian ▁Cr us ade , ▁in ▁which ▁King ▁Philip ' s ▁son ▁Louis ▁led ▁an ▁army ▁south ▁and ▁captured ▁the ▁town ▁of ▁Mar mande ▁in ▁June , ▁mass ac ring ▁its ▁inhabitants . ▁The ▁force ▁moved ▁on ▁to ▁bes ie ge ▁Toul ouse , ▁which ▁held ▁out , ▁and ▁it ▁was ▁during ▁this ▁eng agement ▁that ▁Jean ▁fell ▁ill ▁and ▁died ▁on