▁sons ▁became ▁k ings ▁of ▁Den mark . ▁ ▁He ▁was ▁the ▁last ▁Vik ing ▁r uler ▁of ▁Den mark ▁and ▁an ▁ancest or ▁of ▁all ▁subsequent ▁Dan ish ▁k ings . ▁The ▁remains ▁of ▁other ▁Dan ish ▁k ings ▁are ▁also ▁ent om bed ▁in ▁Ros k ilde ▁C athedral . ▁According ▁to ▁the ▁s aga , ▁S we yn ' s ▁mother ▁was ▁ent om bed ▁inside ▁a ▁pill ar ▁across ▁from ▁the ▁chap el . ▁However , ▁analysis ▁of ▁mit och ond rial ▁DNA ▁proved ▁that ▁this ▁person ▁was ▁not ▁the ▁king ' s ▁mother , ▁as ▁his ▁m t D NA ▁indicated ▁H ap lo group ▁H , ▁H V R 1 ▁ 7 0 2 8 C . ▁ ▁Leg acy ▁One ▁of ▁the ▁leg a cies ▁of ▁King ▁S we yn ▁was ▁a ▁fundamental ▁change ▁in ▁Dan ish ▁society ▁which ▁had ▁been ▁based ▁on ▁whether ▁a ▁person ▁was ▁free ▁or ▁a ▁b onds man . ▁S we yn ▁is ▁often ▁considered ▁to ▁be ▁Den mark ' s ▁last ▁Vik ing ▁king ▁as ▁well ▁as ▁the ▁first ▁medieval ▁one . ▁A ▁strength ened ▁church ▁in ▁al liance ▁with ▁the ▁land - own ing ▁noble ▁families ▁begin ▁to ▁pit ▁their ▁power ▁against ▁the ▁royal ▁family . ▁The ▁pe as ants ▁were ▁left ▁to ▁f end ▁for ▁themselves . ▁▁ ▁S we yn ▁built ▁a ▁strong ▁foundation ▁for ▁royal ▁power ▁through ▁co operation ▁with ▁the ▁church . ▁He ▁completed ▁the ▁final ▁partition ▁of ▁Den mark ▁into ▁dioc eses ▁by ▁corresponding