' s ▁minor ity . ▁However , ▁by ▁the ▁time ▁Con an ▁reached ▁his ▁majority ▁his ▁uncle ▁O do ▁refused ▁to ▁give ▁up ▁his ▁authority . ▁By ▁ 1 0 5 7 ▁Con an ▁captured ▁his ▁uncle , ▁whom ▁he ▁then ▁had ▁ch ained ▁and ▁imprison ed . ▁ ▁Once ▁ent hr oned ▁as ▁Duke ▁Con an ▁II ▁of ▁Brit t any , ▁he ▁faced ▁numerous ▁thre ats , ▁including ▁revol ts ▁from ▁his ▁nobles ▁spons ored ▁by ▁William , ▁Duke ▁of ▁Norm andy , ▁afterwards ▁King ▁of ▁England . ▁Brit t any , ▁an ▁independent ▁C elt ic ▁du chy , ▁had ▁a ▁traditional ▁rival ry ▁with ▁neighbor ing ▁Norm andy . ▁The ▁ 1 0 6 4 – 1 0 6 5 ▁War ▁between ▁Brit t any ▁and ▁Norm andy ▁was ▁spark ed ▁after ▁Duke ▁William ▁supported ▁Riv all on ▁I ▁of ▁Dol ' s ▁re bell ion ▁against ▁Con an ▁II . ▁In ▁ 1 0 6 5 , ▁before ▁his ▁invasion ▁of ▁Ang lo - S ax on ▁England , ▁William ▁of ▁Norm andy ▁sent ▁word ▁to ▁the ▁surrounding ▁count ies , ▁including ▁Brit t any , ▁warning ▁them ▁against ▁attack ing ▁his ▁lands , ▁on ▁the ▁grounds ▁that ▁his ▁mission ▁bore ▁the ▁pap al ▁b anner . ▁▁ ▁Con an ▁prompt ly ▁informed ▁the ▁du ke ▁that ▁he ▁would ▁definitely ▁take ▁the ▁opportunity ▁to ▁in va de ▁the ▁latter ' s ▁du chy . ▁In ▁the ▁history ▁of ▁conflicts ▁between ▁Brit t any ▁and ▁An jou , ▁P