oa ▁B uk ha ▁as ▁their ▁own ▁k h agan ▁in ▁ 1 4 3 3 . ▁This ▁resulted ▁in ▁half ▁a ▁de cade ▁of ▁simultane ous ▁existence ▁between ▁two ▁k h ans ▁supported ▁by ▁oppos ing ▁Mong ol ▁cl ans . ▁ ▁Re ign ▁ ▁T og ht oa ▁B uk ha ▁Khan ▁was ▁an ▁am bit ious ▁leader ▁who ▁asp ired ▁to ▁gain ▁real ▁power ▁and ▁reg aining ▁the ▁former ▁glory ▁of ▁the ▁Y uan ▁D ynast y . ▁His ▁amb itions ▁in ev it ably ▁lead ▁to ▁a ▁conflict ▁of ▁interests ▁with ▁powerful ▁O irat ▁nobles . ▁Although ▁the ▁O ir ats ▁shared ▁the ▁same ▁amb ition ▁of ▁recover ing ▁the ▁glory ▁of ▁G eng his ▁Khan ▁with ▁the ▁new ▁k han , ▁they ▁were ▁well ▁aware ▁of ▁the ▁f ract ured ▁nature ▁of ▁the ▁Mong ol ▁tribes . ▁To ▁buy ▁time ▁before ▁being ▁able ▁to ▁un ite ▁them , ▁they ▁first ▁needed ▁to ▁make ▁peace ▁with ▁the ▁M ing ▁dynast y . ▁The ▁O ir ats ▁were ▁careful ▁not ▁to ▁en rage ▁the ▁M ing ▁by ▁not ▁officially ▁proc laim ing ▁the ▁Y uan ▁and ▁thereby ▁obtained ▁help ▁from ▁the ▁M ing ▁court ▁in ▁defe ating ▁the ▁K hor chin . ▁Ada i ▁Khan ▁of ▁the ▁K hor chin ▁was ▁killed ▁in ▁ 1 4 3 8 . ▁▁ ▁In ▁ 1 4 3 9 ▁T og han ▁installed ▁T og ht oa ▁B uk ha ▁as ▁leader ▁of ▁the ▁eastern ▁Mong ols ▁under ▁the ▁title ▁of ▁Bog d