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Frösön (Frey's island; [fɾøːsøːn]; [fɾøːsœʏːa] in the local dialect, Jamtlandic) is the largest island in the lake Storsjön, located west of the city Östersund in Jämtland, Sweden. During most of recorded history the island was the regional centre of Jämtland.
Map of F 4 Fr%C3%B6s%C3%B6n, Sweden
Frösön is the location of the "Frösö Runestone", the northernmost raised runestone in the world, dating from 1030-1050 AD. Frösön was a separate köping until 1974 but was merged with Östersund at that time.
The island is named after the Norse god Freyr.
The Swedish composer Wilhelm Peterson-Berger had a summer house (and from 1930 a permanent home) on the island. In 1896 Peterson-Berger composed a set of piano pieces entitled Frösöblomster (Flowers of Frösön), and his opera Arnljot from 1910 is partly based on the runic inscriptions on Frösö Runestone.