page_title: Vestfold
section_title: Kings ruling some or all of Vestfold
hierarchical_section_title: Vestfold / History / Viking history / Kings ruling some or all of Vestfold
caption_attribution_description: Gerhard Munthe: Illustration for Halvdan Svartes saga, Heimskringla 1899-edition. Tittelfrise.
context_page_description: Vestfold is a traditional region, a former county and a current electoral district in Eastern Norway. In 2020 the county became part of the much larger county of Vestfold og Telemark. Located on the western shore of the Oslofjord, it bordered the previous Buskerud and Telemark counties. The county administration was located in Tønsberg, Norway's oldest city, and the largest city is Sandefjord. With the exception of the city-county of Oslo, Vestfold was the smallest county in Norway by area.
  Vestfold was located west of the Oslofjord, as the name indicates. It included many smaller, but well-known towns in Norway, such as Larvik, Sandefjord, Tønsberg and Horten; these towns run from Oslo in an almost constant belt of urban areas along the coast, ending in Grenland in neighbouring region Telemark. The river Numedalslågen runs through the county. Many islands are located at the coast. Vestfold is mostly dominated by lowland and is among the best agricultural areas of Norway. Winters last about three months, while pleasant summer temperatures last from May to September, with a July average high of 17 °C.
  Vestfold was traditionally known for shipping and sailing.
context_section_description: Erik Agnarsson
  Halfdan Hvitbeinn (part of Vestfold)
  Eystein Halfdansson
  Halfdan the Mild
  Gudrød the Hunter
  Halfdan the Black, together with his brother, Olaf Gudrødsson
  Ragnvald the Mountain-High, Cousin of Harold Fairhair
  Harald Fairhair
  Bjørn Farmann
  Olaf Haraldsson Geirstadalf, brother of Bjørn
  Harald Gudrødsson Grenske, 976–987
caption: Halfdan the Black, 9th century king of Vestfold. His brother was long believed to be buried at the Gokstad Mound.[26][27]
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