, ▁that ▁the ▁journey ▁also ▁had ▁the ▁purpose ▁of ▁seeking ▁the ▁aid ▁of ▁the ▁King ▁of ▁Jerusalem , ▁Ful k ▁( ). ▁ ▁Return ▁to ▁By z ant ium ▁and ▁acc ession ▁of ▁Manuel ▁I ▁Despite ▁his ▁efforts , ▁Isaac ' s ▁attempted ▁coal ition ▁failed ▁to ▁material ize , ▁while ▁John ▁II ' s ▁position ▁continued ▁to ▁improve . ▁The ▁em peror ' s ▁military ▁success es , ▁particularly ▁following ▁his ▁Sy rian ▁campaign ▁in ▁ 1 1 3 7 – 1 1 3 8 ▁that ▁led ▁to ▁the ▁submission ▁of ▁the ▁Princi p ality ▁of ▁Ant io ch ▁to ▁the ▁By z antine ▁Empire , ▁en hanced ▁his ▁standing ▁with ▁the ▁By z antine ▁arist ocracy , ▁official dom , ▁and ▁the ▁common ▁people . ▁As ▁a ▁result , ▁Isaac ' s ▁supp or ters ▁in ▁the ▁emp ire ▁began ▁to ▁desert ▁his ▁cause . ▁Thus ▁Isaac ▁was ▁forced ▁to ▁seek ▁recon c ili ation ▁with ▁his ▁brother : ▁along ▁with ▁his ▁el dest ▁son ▁John , ▁Isaac ▁met ▁his ▁brother ▁during ▁the ▁imperial ▁army ' s ▁return ▁from ▁Ant io ch ▁in ▁spring ▁ 1 1 3 8 . ▁John ▁II ▁readily ▁forg ave ▁his ▁brother , ▁and ▁brought ▁him ▁to ▁Constantin ople ; ▁indeed , ▁according ▁to ▁Ch oni ates , ▁the ▁em peror ▁was ▁more ▁pleased ▁about ▁this ▁recon c ili ation ▁than ▁his ▁vict ories . ▁So on ▁after , ▁in ▁ 1 1 3 9 , ▁Isaac ' s ▁son ▁John ▁again ▁defect ed ▁to ▁the