* Frigga was banished by the Vikings when they became Christian
* Not all of Scandinavia followed Christianity
* Frigga a female god, took refuge with 11 other witches
* According to legend, Loki (who is the devil) would meet with the 12 every Friday
* On Friday they would plot out tricks to play on the Christians that turned their backs on the old religion
* They used to say, "Beware of Friday's 13"