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Nór (Old Norse Nórr) or Nori is firstly a mercantile title and secondly a Norse man's name. It is stated in Norse sources that Nór was the founder of Norway, from whom the land supposedly got its name. (The name is commonly claimed to derive from ‘nórðrvegr’, ‘northern way’.)

The Chronicle of Lejre (“Chronicon Lethrense”) written about 1170 introduces a primeval King Ypper of Uppsala whose three sons were Dan who afterwards ruled Denmark, Nori who afterwards ruled Norway, and Østen who afterwards ruled the Swedes. But the account then speaks only of the descendants of Dan.

Parallel but not quite identical accounts of Nór the eponym of Norway appear in “Fundinn Nóregr” (‘Norway Found’), hereafter called F, which begins the Orkneyinga saga, and in Hversu Noregr byggðist (‘How Norway was Settled’), hereafter called B, both found in the Flatey Book.

King Thorri (Þorri 'frozen snow') was son of Snær ('Snow') the Old, a descendant of Fornjót ("king of Gotlandi, Kænlandi and Finnlandi"). See Snær and Fornjót for further information. The name Þorri has long been identified with that of Þórr, the name of the Norse thunder god Thor, or thunder personified.

Both accounts state that great sacrifice was made yearly at mid-winter, either offered by Thorri (F) or offered by the Kæns to Thorri (B), whence was derived both the name of the mid-winter sacrifice and the name of the winter month Thorri corresponding to late January and early February in the Roman calendar.

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