 The area was being used as a berth by the 13th century when the waterfront was located much further east than today, and a medieval harbour, known as "Koggahamnen" ("The Cog Harbour"), and a quay, "Koggabron" ("The Cog Bridge"), was also found here as excavations have shown.During the 15th and 16th centuries, a section of the city wall along with two of its towers were found just south of the alley.The customs house on Skeppsbron, built in the 1780s, replaced the warehouse mentioned above.