Stora Sundby castle was mentioned first time in Middle Ages. In 1364 it was besieged and captured by Albrecht during his battle with Magnus Eriksson. From the end of 1300s to the early 1400s it belonged to Lars Ulfsson Blå. After him Stora Sundby was owned by Julita monastery and families of Natt och Dag, Sparre and Chevron.
The present main house was built by Lars Siggesson Sparre, who asked Carl de Geer to design a new castle on the old Norman style. The casle was finished in 1848. The drawings were made up by the English architect J.F. Robinson. In refurbishment underwent castle a fundamental change in the exterior but the interior remained mainly unchanged. The architecture symbolizes a year calendar: 52 rooms (number of weeks per year), 12 small towers (12 months per year), four large towers (four seasons), 365 windows (days per year).References:
Frösöstenen is the northern-most raised runestone in the world and Jämtland's only runestone. It originally stood at the tip of ferry terminal on the sound between the island of Frösön and Östersund. The stone dates to between 1030 and 1050. It has now been relocated to the lawn in front of the local county seat due to the construction of a new bridge, between 1969 and 1971, on the original site.
Frösö runestone inscription means: Austmaðr, Guðfastr's son, had this stone raised and this bridge built and Christianized Jämtland. Ásbjörn built the bridge. Trjónn and Steinn carved these runes.