I don't know who this is, but Snorri Sturalsson lists him in the genealogies but he does not appear in the regnal lists in the same volume! Stammtafeln lists two Svens who died in the same year, neither was King!

Kilde:
http://www3.dcs.hull.ac.uk/cgi-bin/gedlkup/n=royal?royal18711

Er dette samme som Svend Korsfarer, hvis det er tilfelle så er nok Gunnhild Sveinsdatter moren.