Riddarfjärden
Riddarfjärden (, "The Knight Firth") is the easternmost bay of Lake Mälaren in central Stockholm. Stockholm was founded in 1252 on an island in the stream where Lake Mälaren (from the west) drains into the Baltic Sea (to the east); today the island is called Stadsholmen and constitutes Stockholm's Old Town.
Walls of Stockholm
Stockholm's oldest city wall was originally a fortification line built during the second half of the 13th century around Stadsholmen. This line of fortifications is thus intimately connected with the origin of Stockholm, founded by Birger Jarl around the year 1250. The old city wall exact design and location is disputed and unknown. According to one common belief, they are remnants of the oldest city wall preserved in buildings where the wall once was. At the excavations and building surveys, however, such residues have never been found.