▁Sv ends d atter , ▁and ▁he ▁took ▁the ▁mat ron ym ic ▁surname ▁E str id sson ▁after ▁her , ▁emphas izing ▁his ▁link ▁to ▁the ▁Dan ish ▁royal ty . ▁He ▁also ▁mint ed ▁his ▁own ▁co ins . ▁ ▁S we yn ▁sought ▁to ▁cons olid ate ▁his ▁power ▁through ▁links ▁to ▁the ▁church ▁as ▁well ▁as ▁foreign ▁powers , ▁and ▁act ively ▁sought ▁the ▁friendship ▁of ▁the ▁Pop es . ▁He ▁wanted ▁his ▁el dest ▁son ▁Kn ud ▁Magn us ▁crown ed ▁by ▁the ▁Pope , ▁but ▁Kn ud ▁died ▁on ▁the ▁journey ▁to ▁Rome . ▁He ▁also ▁un success fully ▁pressed ▁for ▁Har ald ▁Bl uetooth , ▁the ▁first ▁Christian ▁king ▁of ▁Den mark , ▁to ▁be ▁san ct ified . ▁He ▁was ▁an ▁al ly ▁of ▁Henry ▁III , ▁Holy ▁Roman ▁Emperor ▁against ▁Bald win ▁V ▁of ▁Fland ers ▁in ▁ 1 0 4 9 , ▁and ▁S we yn ▁assist ed ▁his ▁son - in - law ▁Gott sch alk ▁in ▁the ▁Li ut izi ▁Civil ▁War ▁of ▁ 1 0 5 7 . ▁▁ ▁After ▁Har ald ▁Hard r ada ▁was ▁killed , ▁and ▁William ▁the ▁Con quer or ▁had ▁conquer ed ▁England , ▁S we yn ▁turned ▁his ▁attention ▁to ▁England , ▁once ▁ruled ▁by ▁his ▁uncle ▁Can ute ▁the ▁Great . ▁He ▁joined ▁forces ▁with ▁Ed gar ▁Ath eling , ▁the ▁last ▁remaining ▁he ir ▁of ▁the ▁Ang lo - S ax on ▁royal ▁house , ▁and ▁sent ▁a ▁force ▁to ▁attack ▁king