▁e ighth ▁son ▁( second ▁son ▁of ▁Queen ▁Sin de ok ) ▁Grand ▁Prince ▁U ian ▁( Y i ▁Bang se ok ) ▁as ▁crown ▁prince ▁in ▁ 1 3 9 2 . ▁This ▁conflict ▁arose ▁largely ▁because ▁Je ong ▁Do je on , ▁who ▁sh aped ▁and ▁laid ▁down ▁ide ological , ▁institution al , ▁and ▁legal ▁found ations ▁of ▁the ▁new ▁dynast y ▁more ▁than ▁anyone ▁else , ▁saw ▁Jose on ▁as ▁a ▁kingdom ▁led ▁by ▁minister s ▁appointed ▁by ▁the ▁king ▁while ▁Y i ▁Bang won ▁wanted ▁to ▁establish ▁the ▁absolute ▁mon archy ▁ruled ▁directly ▁by ▁the ▁king . ▁With ▁T ae jo ' s ▁support , ▁Je ong ▁Do je on ▁kept ▁limit ing ▁the ▁royal ▁family ' s ▁power ▁by ▁prohib iting ▁political ▁invol vement ▁of ▁princes ▁and ▁attempting ▁to ▁abol ish ▁their ▁private ▁arm ies . ▁Both ▁sides ▁were ▁well ▁aware ▁of ▁each ▁other ' s ▁great ▁anim os ity ▁and ▁were ▁getting ▁ready ▁to ▁strike ▁first . ▁ ▁After ▁the ▁sudden ▁death ▁of ▁Queen ▁Sin de ok , ▁while ▁King ▁T ae jo ▁was ▁still ▁in ▁m our ning ▁for ▁his ▁second ▁wife , ▁Y i ▁Bang won ▁struck ▁first ▁by ▁ra iding ▁the ▁palace ▁and ▁killed ▁Je ong ▁Do je on ▁and ▁his ▁supp or ters ▁as ▁well ▁as ▁Queen ▁Sin de ok ' s ▁two ▁sons ▁( his ▁half - bro thers ) ▁including ▁the ▁crown ▁prince ▁in ▁ 1 3 9 8 . ▁This ▁incident ▁became ▁known ▁as ▁the ▁First ▁Str ife ▁of