Norrtälje is a locality and the seat of Norrtälje Municipality, Stockholm County, Sweden with 17,275 inhabitants in 2010. It is one of the largest towns in Roslagen. History. Norrtälje’s early history dates back to the Iron Age. Around 225 ancient monuments have been found within what is now the city. Three ancient castles are assumed to have stood in the former villages Nordrona, Solbacka and Knutby. Norrtälje traces its more recent history to 1219, when the location was first mentioned as Tälje.
https://en.wikipedia.org/wiki/Norrt%C3%A4lje