▁was ▁custom ary . ▁This ▁emphas is ▁on ▁his ▁descent ▁is ▁very ▁indic ative ▁of ▁Isaac ' s ▁per ception ▁of ▁his ▁status , ▁and ▁most ▁likely ▁represents ▁a ▁conscious ▁choice ; ▁a ▁legit im izing ▁device ▁for ▁his ▁imperial ▁amb itions . ▁ ▁Ex ile ▁and ▁w ander ings ▁ ▁Rel ations ▁between ▁Isaac ▁and ▁John ▁II ▁were ▁cord ial ▁at ▁first , ▁but ▁began ▁to ▁d eter ior ate , ▁so ▁that ▁by ▁ 1 1 3 0 ▁they ▁had ▁become ▁est r anged . ▁The ▁reasons ▁for ▁this ▁are ▁left ▁un exp la ined ▁by ▁the ▁sources ; ▁Nik et as ▁Ch oni ates ▁and ▁John ▁K inn amos ▁simply ▁report ▁that ▁Isaac ▁had ▁set ▁his ▁sight ▁on ▁the ▁throne . ▁Poss ibly ▁the ▁on set ▁of ▁the ▁r ift ▁between ▁the ▁brothers ▁was ▁in ▁ 1 1 2 2 , ▁when ▁John ▁raised ▁his ▁own ▁first born ▁son , ▁Alex ios , ▁to ▁co - em peror , ▁thus ▁su pers eding ▁Isaac . ▁In ▁ 1 1 3 0 , ▁Isaac ▁became ▁involved ▁in ▁a ▁consp i racy ▁against ▁John ▁at ▁a ▁time ▁when ▁the ▁latter ▁was ▁away ▁from ▁Constantin ople , ▁campaign ing ▁against ▁the ▁Sel j uk ▁Tur ks ▁of ▁the ▁Sultan ate ▁of ▁Rum . ▁The ▁consp i racy ▁was ▁un cover ed , ▁but ▁Isaac ▁and ▁his ▁two ▁sons ▁managed ▁to ▁fle e ▁Constantin ople ▁and ▁find ▁refuge ▁at ▁the ▁court ▁of ▁the ▁Dan ish m end id ▁em ir ▁Gü m üs ht