Note:
His correct patronymic is Svendsen/Svendsson. Ulfsson was his father's patronymic, which he would never use, and which his father didn't use either.
↑ Source: #S1 Page: Database online. Data: Text: Record for Svend II (King of Denmark) ULFSSON ESTRIDSSEN
WikiTree profile Ulfsson-33 created through the import of Ancestor's that we lost, the Decendants they left behind_2011-08-28_01 (2).ged on Sep 12, 2011 by Willette Bryant. See the Changes page for the details of edits by Willette and others.
Source: S1 Author: Ancestry.com Title: Public Member Trees Publication: Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2006; Repository: #R1