Its strategic location at the entrance to Söderköping, at the time one of the country's wealthiest cities, was obvious to Birger Magnusson's guardianship, which was led by the marsk Torkel Knutsson.
Dess strategiska läge vid inloppet till Söderköping, då en av rikets rikaste städer, var uppenbar för Birger Magnussons förmyndarstyre som leddes av marsken Torgils Knutsson.