Norway. A Jamtish Neolithic culture emerged during late Roman Iron Age in Storsjöbygden, though the hunter-gatherers had come in contact with this lifestyle long before they settled down themselves. Though since the hunts were rich and successful in Jämtland it took a long time before a change occurred. The Neolithic Revolution happened quickly once initiated since the Trønders had been farmers for a long time and some of the Jamts had already begun herding. The Jamtish farmers grew first and foremost barley, though palynological study bear witness of e.g. hemp. At the end of the 4th century a fortress, Mjälleborgen, was established on Frösön in order to control the excessive iron production and trade that took place. The western influence from Trøndelag through Jämtland to Norrland was at the time extensive. At the same time Kurgans starts appearing in the Jämtland landscape, such as Högom in Medelpad. The term Hög was derived from the Old Norse word haugr meaning mound or barrow. The expansion of settlement was somewhat halted in the 7th century and Mjälleborgen was abandoned in the 8th century. A migration among the people occurred at the same time and the people concentrated themselves around Storsjön with villages such as Frösön, Brunflo, Rödön, Hackås, Lockne and Näs being larger communities. Storsjöbygden became an oasis in the middle of the Scandinavian inland, surrounded by dense forest. Horses were the only reliable mean of communications and a necessity. Medieval period During the Viking Age the settlement in the province grew. This may be seen as a confirmation to the sagas written by Snorri Sturluson, where he narrates about the Vikings who fled from Harald Fairhair and Norway and took residence in Jämtland, just like many Norwegians at the same time fled and colonized Iceland. When a climate change (which later resulted in the Medieval Warm Period) took place Frösön acquired the position as regional centre. The warmer climate made the agriculture flourish, the stock-raising and the special inland Scandinavian herding or "livestock drifting", buföring, was developed further. This is especially true for the southern parts of Jämtland when the so-called "fell cow" was introduced. The hunt for moose and other wild animals increased during this period. Among the worshiped gods in Norse mythology Jämtland was dominated by the older Vanir gods (Freyr, Njord, Ullr etc.). Though the Æsirs were also worshiped. As the population continued to grow the Jamts established