Rauðúlfs þáttr
Rauðúlfs þáttr is a short allegorical story preserved in Iceland in a number of medieval manuscripts. The author is unknown but was apparently a 12th–13th century ecclesiastical person. The story is about Saint Olav's (Olav Haraldsson II king of Norway 995–1030) visit to a wise man named Rauðúlfr (also called Rauðr and Úlfr), their entertainment in the evening, the staying overnight in a round, rotating and richly decorated house and a vision the king had in his dream that night. The story is sometimes incorporated in the Separate Saga of St. Olaf.