Sollentuna Hundred was one of the "eight hundreds" that composed the mediaeval Uppland folkland of Attundaland. The name, similar to that of neighbouring Vallentuna Hundred, was written as Sollendahundæri in the 14th century; the -enda- in the name signifies a place at the end of a lake. Sollentuna Church is indeed located by Norrviken lake, but it is also entirely possible that Sollenda paraphrases a much older word, perhaps meaning swamp or marshland, altered to imitate the name of the neighbouring hundred. The local ting originally met in Granby in Spånga socken, but moved to Barkarby in the 17th century, and finally to Rotebro in the 20th century. The hundred was long an important area for local and regional commerce. Roads leading to Bergslagen, Uppsala, and Roslagen crossed the isthmus between Norrviken and Edsviken. The lakes were crossed by important shipping routes, and there was also a harbour since the Viking Age.
In the 12th century, churches were founded in Sollentuna, Järfälla, Spånga, and Bromma. The hundred grew around these churches, growing from a few lone farms to a number of small villages. The majority of the population worked in agriculture until well towards the end of the 19th century. At that time, the Mälaren Line and Northern Main Line railways were built, and a number of station towns cropped up within the hundred, many of which today are part of the suburbs of Stockholm: for example, Sundbyberg, Bromsten, Jakobsberg, Tureberg, Rotebro, and Upplands Väsby. Sollentuna Hundred's proximity to the capital had a profound effect on its development and expansion in the first half of the 20th century. In 1916, Bromma socken and its towns were incorporated into the city, and Spånga socken followed suit in 1949.
Sockens
Sollentuna Hundred was originally composed of five sockens:
