he Gulatingslag. The Frostating was the assembly for the leaders in the Trondheimsfjord area; the earls Jarls of Lade, near Trondheim, seem to have enlarged the Frostatingslag by adding the coastland from Romsdalsfjord to the Lofoten Islands. A lagting developed in the area of Lake Mjøsa in the east and eventually established its meeting place at Eidsvoll, becoming known as the Eidsivating. The area around Oslofjord, although at times closely tied to Denmark, developed a lagting—with its meeting place at Sarpsborg called the Borgarting.
Viking Age
The Viking Age was characterized by expansion and emigration by Viking seafarers. According to tradition, Harald Fairhair (Harald Hårfagre) unified them into one in 872 after the Battle of Hafrsfjord in Stavanger, thus becoming the first king of a united Norway. (The date of 872 may be somewhat arbitrary. In fact, the actual date may be just prior to 900). Harald's realm was mainly a South Norwegian coastal state. Harald Fairhair ruled with a strong hand and, according to the sagas, many Norwegians left the country to live in Iceland, the Faroe Islands, Greenland, and parts of Britain and Ireland. The modern-day Irish cities of Dublin, Limerick, and Waterford were founded by Norwegian (and Danish) settlers. Norse traditions were slowly replaced by Christian ones in the 10th and 11th Centuries. This is largely attributed to the missionary kings Olav Tryggvasson and St. Olav. Haakon the Good was Norway's first Christian king, in the mid-10th century, though his attempt to introduce the religion was rejected. Born sometime in between 963–969, Olav Tryggvasson set off raiding in England with 390 ships. He attacked London during this raiding. Arriving back in Norway in 995, Olav landed in Moster. There he built a church which became the first Christian church ever built in Norway. From Moster, Olav sailed north to Trondheim were he was acclaimed King of Norway by the Eyrathing in 995
