▁Kh agan ▁T ais un ▁of ▁the ▁Northern ▁Y uan ▁before ▁the ▁eight ▁white ▁y ur ts ▁of ▁G eng his ▁Khan . ▁T ais un ▁Khan ▁felt ▁that ▁the ▁M ing ▁was ▁already ▁weak ▁enough ▁to ▁be ▁dismiss ed , ▁and ▁open ly ▁proc laimed ▁the ▁Y uan ▁dynast y ▁with ▁himself ▁as ▁T ais un ▁( T a iz ong ), ▁a ▁move ▁supported ▁by ▁most ▁Mong ols ▁except ▁the ▁O ir ats , ▁who ▁felt ▁more ▁time ▁was ▁needed ▁to ▁cons olid ate ▁their ▁g ains . ▁Fort un ately , ▁the ▁M ing ▁were ▁indeed ▁too ▁weak ▁to ▁strike ▁into ▁the ▁Mong ol ▁heart land ▁like ▁the ▁dece ased ▁Y ong le ▁Emperor ▁had ▁done ▁in ▁the ▁past . ▁M ing ▁showed ▁its ▁disapp ro val ▁by ▁calling ▁T ais un ▁Khan ▁of ▁the ▁Northern ▁Y uan ▁instead ▁of ▁Ta iz ong ▁( 太 宗 ) ▁of ▁the ▁Great ▁Y uan . ▁ ▁After ▁T og han ▁died , ▁T ais un ▁Khan ▁made ▁T og han ' s ▁son ▁Es en ▁Ta ishi ▁a ▁ta ishi , ▁and ▁his ▁younger ▁brother ▁Ag bar jin ▁a ▁j in ong . ▁ ▁During ▁the ▁reign ▁of ▁T ais un ▁Khan , ▁Es en ▁Ta ishi ▁sub j ug ated ▁the ▁J urch ens ▁in ▁Man ch uria , ▁the ▁K ara ▁Del ▁kingdom ▁around ▁H ami ▁City , ▁and ▁the ▁Uri ank h ais ▁( T uv ans ) ▁in ▁Si ber ia . ▁ ▁Conf lict ▁with ▁M ing