Myths of the Norsemen: From the Eddas and Sagas

When the gods were reduced to the rank of demons by the introduction of Christianity, Loki was confounded with Saturn, who had also been shorn of his divine attributes, and both were considered the prototypes of Satan. The last day of the week, which was held sacred to Loki, was known in the Norse as Laugardag, or wash-day, but in English it was changed to Saturday, and was said to owe its name not to Saturn but to Sataere, the thief in ambush, and the Teutonic god of agriculture, who is supposed to be merely another personification of Loki.