Gagliaudo said:
Could I ask you for a (ore more) map with all the most important places of Vikings history (with original viking names

) ???
Many trading stations were established in Norway during the Viking age. Such places were called markets (marknaðr, kaupangr). There were no cities/towns in this period. The vast majority were coastal. Rolvsøy, Oddernes, Avaldsnes, Giske, Ørlandet, Lade, Tjøtta, Sandnes, Steigen and Bjarkøy.
What is the definition of city/town? A city differs from trading stations, fishing camps or other small settlements by a continuous development and interaction with the surroundings. Economy, administration, culture and religion are important tasks to handle for a young city. These operations will give the city a structure in proportion to the surroundings (a more dense population). Specialist citizens (merchants, craftsmen, officials, etc.) provide a different social structure to the city. All these functions were continually developed through time.
Norwegian historians have developed two main theories (I am lost in translation here

):
P. A. Munch (1849) "Strandstedsteorien": most medieval cities were developed from trading stations and fishing camps.
Gustav Storm (1900) "Kongestadsteorien": the most important cities were founded directly by the King (Konge = King).
Archaeological evidence supports Munchs theory - continuity in the city development.
Norwegian kings founded many cities in the period 1000-1100:
Nidaros (Trondheim): Olav Tryggvason (995-1000).
Sarpsborg: Olav Haraldsson (1015-1030).
Oslo: Harald Hardråde (1046-1066).
Bergen: Olav Kyrre (1066-1093).
Konghelle: Sigurd Jorsalfare (1103-1130).
Tønsberg ?
Source: Jon Vidar Sigurdsson "Norsk Historie 800-1300" © Det Norske Samlaget. Thanks a bunch Jon Vidar!
I will post a map later...