The Battle of Nesjar was a sea battle off the coast of Norway in 1016. The exact location is unkown, but it is somewhere in today's Langesundfjorden. The fighting parties were the throne claimant Olav Haraldsson (later Saint Olav) on one side, and an alliance backing the Swedish vassal Svein Ladejarl on the other. Olav II Haraldsson ( 995 – 1030), king from 1015–1028, called during his lifetime the Fat and afterwards known as Saint Olaf, was born in the year in which Olaf Tryggvesson came to Norway. ...

After the defeat of Olav Tryggvason at Svolder, Norway had been divided into a Swedish part governed by Svein Ladejarl and a Danish part run by Eirik Jarl. However, after Eirik joined his brother-in-law Canute the Great in his attempt to conquer England, Danish rule folded, and power was assumed by Olav Haraldsson, a throne claimant from the Harald Fairhair family line. Olav Tryggvason (969 - September 9, 1000) was a great-grandson of Harald Hairfair He began his meteoric career in exile as his ancestors fled from the executions of the royal family by Eric Bloodaxe. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Olav II Haraldsson ( 995 – 1030), king from 1015–1028, called during his lifetime the Fat and afterwards known as Saint Olaf, was born in the year in which Olaf Tryggvesson came to Norway. ... Harald I (b. ...

Svein, who was based in Trøndelag, learned that Olav was rallying support in Eastern Norway. He set sail along the coast of Norway. Along the way he joined forces with those of several allies among Norway's farmer-chieftains. The most prominent of these was Erling Skjalgsson. Trøndelag is the name of a geographical region in the middle of Norway, consisting of the two counties Nord-Trøndelag and Sør-Trøndelag. ... Erling Skjalgsson (d. ...

Olav, on the other hand, had finished raising his forces, and had begun his trip northwards to confront Svein. The fleets clashed off the coast of today's Telemark. Few accounts of the battle survive; however, it is generally regarded as a fierce battle with heavy casualties. None of the major players were killed, as would be usual in this age of chieftains leading the line. However, Svein Ladejarl was chased off and fled to Sweden, thus relinquishing his grip on power. Telemark is a county in Norway, bordering Vestfold, Buskerud, Hordaland, Rogaland and Aust-Agder. ...

The road was now seemed open for Olav to establish a unified rule of Norway. However, along the way he was later forced to ally with Erling Skjalgsson, an alliance which was always uneasy. It also ended violently when Erling was killed in connection with the battle of Boknafjorden in 1028. His followers got revenge two years later, when Olav Haraldsson himself was killed in the battle of Stiklestad. Olav II Haraldsson ( 995 – 1030), king from 1015–1028, called during his lifetime the Fat and afterwards known as Saint Olaf, was born in the year in which Olaf Tryggvesson came to Norway. ... The Battle of Stiklestad (Old Norse Stiklarstaðir) in 1030 is one of the most famous battles in the history of Norway. ...