

Sorry, but he seems to have died the same year he was buried in a pillar tomb inside the Roskilde Cathedral. S. døde paa Kongsgaarden i Søderup i Slesvig 28. April 1076 (de danske Aarbøger have, sikkert urigtig, 1074) og blev begravet i Roskilde Domkirke.
https://runeberg.org/dbl/17/0006.html
I see.
Sweyn II of Denmark
"Born c. 1019
England
Died 28 April 1076
Søderup, Hjordkær Parish, Denmark"
https://en.wikipedia.org/wiki/Sweyn_II_of_Denmark