▁reun ited ▁the ▁Mong ol ▁tribes ▁and ▁threatened ▁the ▁M ing ▁dynast y ▁to ▁their ▁south ▁for ▁the ▁first ▁time ▁since ▁the ▁Battle ▁of ▁K her len ▁in ▁ 1 4 0 9 . ▁ ▁Early ▁life ▁ ▁After ▁the ▁previous ▁k han ▁O y ir ada i ' s ▁death ▁in ▁ 1 4 2 5 ▁an ▁inter ne c ine ▁war ▁last ing ▁several ▁years ▁broke ▁out ▁among ▁the ▁O ir ats ▁under ▁Mah am ud ▁( B ah am u , ▁Bat ula ) ▁and ▁western ▁Mong ol ▁cl ans ▁led ▁by ▁Gul ichi ' s ▁family . ▁The ▁central ▁and ▁eastern ▁Mong ol ▁cl ans , ▁in ▁the ▁meant ime , ▁proc laimed ▁Ada i ▁Khan ▁as ▁the ▁great ▁k han ▁shortly ▁after ▁O y ir ada i ' s ▁death ▁in ▁ 1 4 2 5 . ▁ ▁T og ht oa ▁B uk ha ▁was ▁the ▁el dest ▁son ▁of ▁A ja i ▁who ▁was ▁a ▁post hum ous ▁birth ▁of ▁El beg ▁Khan ▁( d . 1 3 9 9 ) ▁and ▁Ö l je it ü ▁the ▁Beaut y . ▁While ▁wand ering ▁with ▁his ▁brothers ▁in ▁western ▁Mong olia , ▁T og ht oa ▁B uk ha ▁met ▁Mah am ud ' s ▁son ▁and ▁successor , ▁T og han ▁Ta ishi ▁of ▁the ▁Four ▁O ir ats . ▁The ▁latter ▁married ▁him ▁to ▁his ▁daughter ▁and ▁wanted ▁to ▁use ▁him ▁as ▁pa wn . ▁The ▁O ir ats ▁crown ed ▁T og ht