▁families ▁After ▁the ▁death ▁of ▁King ▁Je ong jo , ▁the ▁Jose on ▁faced ▁difficult ▁external ▁and ▁internal ▁problems . ▁Intern ally , ▁the ▁foundation ▁of ▁national ▁law ▁and ▁order ▁weak ened ▁as ▁a ▁result ▁of ▁" S edo " ▁politics ▁( in - law ▁government ) ▁by ▁royal ▁in - law ▁family . ▁ ▁Young ▁King ▁Sun jo ▁succeeded ▁King ▁Je ong jo ▁in ▁ 1 8 0 0 . ▁With ▁Je ong jo ' s ▁death ▁the ▁In trans igent ▁Patri arch ▁fa ction ▁seized ▁power ▁with ▁the ▁reg ency ▁of ▁Queen ▁Dow ager ▁Je ong sun , ▁whose ▁family ▁had ▁strong ▁t ies ▁to ▁the ▁In trans ig ents , ▁and ▁initi ated ▁a ▁per sec ution ▁of ▁C athol ics . ▁But ▁after ▁the ▁ret irement ▁and ▁death ▁of ▁the ▁Queen ▁Dow ager , ▁the ▁In trans ig ents ▁were ▁gradually ▁ou sted ▁and ▁the ▁Ex ped ient ▁fa ction , ▁including ▁the ▁And ong ▁Kim ▁family ▁of ▁Kim ▁Jo - sun , ▁the ▁father ▁of ▁the ▁queen , ▁gained ▁power . ▁Grad ually ▁the ▁And ong ▁K ims ▁came ▁to ▁domin ate ▁the ▁court . ▁ ▁With ▁the ▁dom ination ▁of ▁the ▁And ong ▁K ims , ▁the ▁era ▁of ▁* sed o ▁politics * ▁or ▁in - law ▁rule ▁began . ▁The ▁form id able ▁in - law ▁line age ▁mon opol ized ▁the ▁vital ▁positions ▁in ▁government , ▁holding ▁s way ▁over ▁the ▁political ▁scene , ▁and ▁interven ing ▁in ▁the ▁succession ▁of ▁the ▁throne .