Sune Sik (born c. 1154) was allegedly a Swedish prince. According to Olaus Petri, he would have been a younger son of King Sverker I of Sweden and father of Ingrid Ylva. In surviving contemporary documents one Sune Sik can be found who lived much later. That Sune Sik made a donation to Vreta Abbey as late as in 1297. He might have ordered a restoration of a chapel in which he eventually was interred, and later Cistercian tradition may then have turned him into a prince. This has caused some historians to view Olaus Petri's account of him as unreliable.
Sune Sik, as a son of King Sverker, is counted by other Swedish historians as a person of history and the man buried at Vreta (see photo).Lars O. Lagerqvist and Nils Åberg (2002) in Kings and Rulers of Sweden p. 15Nils Ahnlund Historisk tidskrift 1945 p. 332-351Markus Lindberg Meddelanden från Östergötlands länsmuseum 2003 p. 72, 74 & 80 According to 18th-century Swedish Master of Philosophy Magnus Boræn, Sune was also Duke of ÖstergötlandBorænius, Magnus in Klostret i Vreta i Östergötland 1724 (published again 2003) (at a time when the use of such a title is not known in SwedenProf. Jan Svanberg in Furstebilder från folkungatid p. 97).
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