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The northern countries, Norway in particular, offer a theme that seems to have come directly from the night hosts we have been examining. Here the Wild Hunt is known as Oskoreia, the Terrifying Ride.1 This host is a troop of masked men or spirits*74 that ride horses (ridende julevetter) between Christmas and Epiphany or Santa Lucia Day,†75 hence another name for the Wild Hunt: Lussiferdi. In Scandinavia the twelve-day cycle can run from December 13 to Christmas or from Christmas to January 13. We can note other names in evidence—Julereia, Trettenreia, Fossareia, and Imridn—all including the word rei or reid, meaning “to ride,” “to go by horse,” sometimes grafted on the determiners Jul/Jól (Christmas) or Imbre/Imbredagene. These terms designate the four days of Lent of the liturgical year (ieiunia quatuor) and Fosse (name of a spirit).2 There is also another name for this time of the year: Trettenreia or Trettandreia, “the troop of horsemen of the thirteenth day (of winter).
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Claude Lecouteux (Phantom Armies of the Night: The Wild Hunt and the Ghostly Processions of the Undead)