Грипсхольм
From the Gripsholm Castle in Mariefred, which he built, Bo Jonsson governed the entire valley of Lake Mälaren, Hälsingland, all of Finland, large parts of Västergötland, Eastern Östergötland, and the Småland coast, including the city of Kalmar. He secured the Finnish fiefs as a reward for having assisted Albert to the throne of Sweden.