▁the ▁protection ▁offered ▁by ▁An jou . ▁ ▁In ▁ 9 9 6 , ▁at ▁about ▁the ▁age ▁of ▁six teen , ▁Geoff rey ▁entered ▁into ▁a ▁d yn astic ▁al liance ▁with ▁Richard ▁II , ▁Duke ▁of ▁Norm andy , ▁with ▁a ▁diplom atic ▁double ▁marriage ▁between ▁the ▁two ▁houses . ▁The ▁church - san ction ed ▁marriage ▁cer emon ies ▁were ▁held ▁at ▁Mont ▁Saint - Mich el , ▁on ▁the ▁Bre ton - N orm an ▁border , ▁and ▁while ▁Geoff rey ▁married ▁Haw ise ▁of ▁Norm andy , ▁daughter ▁of ▁Richard ▁I ▁of ▁Norm andy ▁and ▁sister ▁of ▁Richard ▁II , ▁Richard ▁married ▁Jud ith ▁of ▁Brit t any , ▁Geoff rey ' s ▁sister . ▁ ▁Geoff rey ▁and ▁Haw ise ▁had ▁four ▁children : ▁ ▁Alan ▁III ▁of ▁Brit t any ▁( 9 9 7 - 1 0 4 0 ) ▁ ▁Even us ▁( born ▁c . ▁ 9 9 8 , ▁died ▁after ▁ 1 0 3 7 ) ▁ ▁O do , ▁Count ▁of ▁Pent hi è vre ▁( d ied ▁ 1 0 7 9 ) ▁ ▁Ad ela , ▁Abb ess ▁of ▁Saint - Ge org es ▁ ▁Geoff rey ▁died ▁on ▁ 2 0 ▁November ▁ 1 0 0 8 ▁while ▁trav elling ▁on ▁a ▁pil gr image ▁to ▁Rome . ▁ ▁Notes ▁ ▁References ▁ ▁See ▁also ▁D uk es ▁of ▁Brit t any ▁family ▁tree ▁ ▁Category : 9 8 0 ▁birth s ▁Category : 1 0 0 8