Östhammar is a locality and the seat of Östhammar Municipality, Uppsala County, Sweden with 4,534 inhabitants in 2010. Today Östhammar Municipality is a part of Uppsala County, but the area has historically been a part of Stockholm County. History. Östhammar's city status was granted by king Albert in 1368. During this period a castle called Östhammarshus was built, but already in 1434 the castle was burnt down by its Danish vogt, who fled to Denmark over the sea when faced with the Engelbrekt rebellion.
https://en.wikipedia.org/wiki/%C3%96sthammar
Östhammar is a locality and the seat of Östhammar Municipality, Uppsala County, Sweden with 4,534 inhabitants in 2010. Today Östhammar Municipality is a part of Uppsala County, but the area has historically been a part of Stockholm County. History. Östhammar's city status was granted by king Albert in 1368. During this period a castle called Östhammarshus was built, but already in 1434 the castle was burnt down by its Danish vogt, who fled to Denmark over the sea when faced with the Engelbrekt rebellion.
