The municipality of Ringerike was created on 1 January 1964 after the merger of the town of Hønefoss and the rural municipalities of Hole, Norderhov, Tyristrand, and Ådal. However, the area of Hole was removed from the municipality of Ringerike on 1 January 1977 to become a separate municipality once again. The historic area of Ringerike included not just the modern municipality of Ringerike but also Hole and (sometimes) the eastern parts of Modum and Krødsherad.
There are many archaeological remains in the area, dating from the earliest times as well as from the medieval period. Ringerike has been mentioned in Norwegian history since the earliest times. Ringerike style, a historic Scandinavian animal art form, was first discovered on the rune stone in Ringerike, including the Alstad stone (Alstadsteinen), a rune stone was found on the farm Nedre Alstad in Østre Toten. Both Ulvøya an island near Oslo and Ringerike are mentioned in the text. Probably also Dynna rock (Dynnasteinen), a rune stone was found on Nordre Dynna in the traditional region of Hadeland at Gran and are of the same type of red sandstone, typical of Ringerike.
Dagling or Dögling was a legendary clan of the petty kingdom Ringerike. It was descended from a Dag the Great. One of the sons of Dag the Great according to Hversu Noregr Byggðist was Óli, who was the father of Dag, the father of Óleif the father of Hring (the old king Ring of Frithiof's Saga), the father of Olaf, the father of Helgi, the father of Sigurd Hjort, the father of Ragnhild, who was the mother of Harald Fairhair(Harald Hafdi).
In the early Viking Age, before Harald Fairhair became the first king of Norway, Ringerike was a petty kingdom. Sigurd Hjort, king of Ringerike, was the father of Ragnhild Sigurdsdotter, the mother of Harald Fairhair. Following Harald's consolidation of Norway in the late 800s, the kingdom appears to have been ruled by a series of local jarls and client kings. One, Harald's son Halfdan Haleg, met his end in Orkney at the hands of Jarl Torf-Einarr. This was an act of revenge !..
A later sub-king of Ringerike, Sigurd Syr, was the father of Harald Hardråde and the step father of Olav den hellige, both kings of Norway. According to the Heimskringla, "(When) King Olaf Tryggvason came to Ringerike to spread Christianity, Sigurd Syr and his wife allowed themselves to be baptized".