The legend of Jata and Kata, noted by the vicar Mogens Pedersen from Herdal in 1635. "A long, long time ago two trolls, Jata and Kata, stood on the shores of the Great Lake brewing a conncoction in their cauldrons. They brewed and mixed and added to the liquid for days and weeks and years. They knew not what would result from their brew but they wondered about it a great deal. One evening there was heard a strange sound from one of their cauldrons. There was a wailing, a groaning and a crying, then suddenly came a loud bang. A strange animal with a black serpentine body and a cat-like head jumped out of the cauldron and disappeared into the lake. The monster enjoyed living in the lake, grew unbelievably larger and awakened terror among the people whenever it appeared. Finally, it extended all the way round the island of Frösön, and could even bite its own tail. Ketil Runske bound the mighty monster with a strong spell which was carved on a stone and raised on the island of Frösön. The serpent was pictured on the stone. Thus was the spell to be tied till the day someone came who could read and understand the inscription on the stone." According to other versions of the story, the person who bound the monster was called Gudfast, possibly linked to Östmund Gudfastsson who made Jämtland Christian in the 12th Century.