The site used to consist of several small natural islands in the sound between the islands of Zealand and Amager. On the largest of these, Strandholmen (English: Beach Islet), Bishop Absalon of Roskilde constructed a small castle in 1167. In 1250 the castle was extended with two side towers to get the appearance that is now depicted on Copenhagen's Coat of Arms. The castle was conquered by the Hanseatic League 1368 and pulled down the following year as part of peace terms. Shortly after Copenhagen Castle was built on the same site and it became the residence for the Danish king in 1443.