Sigtrygg was a powerful man in
Nerike who received
Saint Olaf
Olaf II Haraldsson ( – 29 July 1030), later known as Saint Olaf (and traditionally as St. Olave), was King of Norway from 1015 to 1028. Son of Harald Grenske, a petty king in Vestfold, Norway, he was posthumously given the title '' Rex Per ...
. He is said to have been the ancestor of a Swedish noble family named
Natt och Dag
Natt och Dag (, literally "night and day") is a Swedish noble family and the oldest surviving family of pure Swedish extraction, with origins stretching back at least as far as the late thirteenth century. However, the actual name ''Natt och Dag' ...
(''night and day'').
Swedish nobility
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