ou anc é ▁had ▁served ▁as ▁the ▁" Bre ton ▁March " ▁or ▁border ▁town . ▁During ▁Con an ' s ▁ 1 0 6 6 ▁campaign ▁against ▁An jou , ▁he ▁took ▁P ou anc é ▁and ▁S egr é , ▁and ▁arrived ▁in ▁Ch âteau - G ont ier , ▁where ▁he ▁was ▁found ▁dead ▁after ▁don ning ▁poison ed ▁r iding ▁glo ves . ▁Duke ▁William ▁was ▁widely ▁sus pected . ▁He ▁was ▁also ▁asked ▁to ▁help ▁William ▁the ▁Con quer or ▁on ▁his ▁ 1 0 6 6 ▁con quest ▁of ▁England , ▁but ▁refused , ▁saying ▁that ▁the ▁Norm ans ▁poison ed ▁his ▁father ▁in ▁ 1 0 4 0 . ▁ ▁Con an ▁II ▁died ▁leaving ▁no ▁known ▁issue . ▁It ▁is ▁possible ▁he ▁died ▁because ▁the ▁glo ves ▁he ▁was ▁we aring ▁were ▁poison ed , ▁and ▁he ▁sw allowed ▁the ▁poison ▁when ▁he ▁w ip ed ▁his ▁mouth ▁with ▁the ▁glo ve . ▁He ▁was ▁succeeded ▁by ▁his ▁sister ▁Haw ise ▁and ▁brother - in - law , ▁Ho el ▁II , ▁whose ▁marriage ▁may ▁have ▁been ▁a ▁political ▁move ▁to ▁cons olid ate ▁and ▁stabil ize ▁the ▁east ▁and ▁west ▁regions ▁of ▁the ▁du chy ▁following ▁Con an ' s ▁death . ▁ ▁References ▁ ▁Bibli ography ▁▁▁▁ ▁Category : D uk es ▁of ▁Brit t any ▁Category : 1 0 3 0 s ▁birth s ▁Category : 1 0 6 6 ▁death s ▁Category : Med ieval ▁child ▁r ul ers ▁Category :