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Seim
Sæheim (Seim) at Lygrefjord is mentioned as one of the royal farms of Harald Hårfagre. Several of the first Norwegian national kings had their seat here, and the farm became Crown Property up to the 1400s. According to the sagas, Håkon den gode is buried on the farm.
Lysekloster- The monks and nature
Lysekloster was the largest agricultural property in the country when it was phased out during the Reformation in 1537. In its prime this cloister encompassed two-thirds of all the farms in Os. The monks introduced and cultivated new plant species and it was probably they who stocked the waters with fish not indigenous to the area. This legacy from the Middle Ages has left a lasting mark.