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There was a fortress built here in the mid-late 14th century, under the reign of Albert of Sweden. It was located on the small island "Stäkesön" in the middle of the strait. It became the residence of the Swedish Archbishop until 1517, when the Archbishop Gustav Trolle locked himself in there to avoid trial, and the Swedish government demanded and carried out the demolition of the fortress. The procedure was formally unauthorized because at the time State property was to be separate from Church property. As a revenge for this and other perceived injustices, Trolle, assisted by the Danish King Christian II, took revenge in the Stockholm Bloodbath of 1520.