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.
Pillage of Sigtuna
The Pillage of Sigtuna was an event in the summer of 1187 described in the "Eric Chronicles" and in annals from the 13th century. According to descriptions, the town of Sigtuna was burnt on August 12 and Archbishop Johannes of Uppsala was killed near the Almarestäkets fort. At that time, Sigtuna was the most important town of medieval Sweden. The "Eric Chronicles" describes the events as follows:According to the "Eric Chronicles", Jon Jarl was also killed during the incident. The chronicle also describes that these events eventually led to the founding of Stockholm by Birger Jarl, who wanted to protect Sweden from sea invasions.