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.
Gamla stan
Stockholm derives its mythological origin from a dwelling place called "Agnefit". As the second element "fit" means 'moist meadow', this place was supposedly located on the western shore of today's Stadsholmen (arguably the only possible location for a meadow at the time). The first element of this name is, explains the historian Snorri Sturluson (1178–1241), derived from King Agne, a presumably mythological king who, in a dim and distant past (around 400 A.D. according to some historians), encamped here after having successfully raided Finland. His intentions were to marry "Skjalf", the daughter of the defeated Finnish chieftain. The young woman, however, tricked him to arrange a celebration including prominent guests which eventually turned into a boozing party, and, while Agne slept in a drunken stupor, Skjalf had him hanged in his gold necklace before escaping.
While the reliability of this story remains disputed, dendrochronological examinations of logs found on Helgeandsholmen just north of Stadsholmen in 1978-1980, concluded these trees were cut down during the period 970-1020, most of them from the later part of that period, and these logs presumably gave the entire city its present name, "Stock-holm", "Log-Islet".