Ladejarl-Fairhair succession wars: Battle of Stiklestad: King Olaf II fights and dies trying to regain his Norwegian throne from the Danes.

The Earls of Lade were a dynasty of Norse jarls who ruled what is now Trøndelag and Hålogaland from the 9th century to the 11th century.

The Kingdom of Norway as a unified realm dates to the reign of King Harald I Fairhair in the 9th century. His efforts in unifying the petty kingdoms of Norway resulted in the first known Norwegian central government. The country, however, soon fragmented and was collected into one entity in the first half of the 11th century, and Norway has retained a monarchy since that time. Traditionally, it has been viewed as being ruled by the Fairhair dynasty, though modern scholars question whether the eleventh century kings and their successors were truly descendants of Harald.

The Battle of Stiklestad in 1030 is one of the most famous battles in the history of Norway. In this battle, King Olaf II of Norway was killed. During the pontificate of Pope Alexander III, the Roman Catholic Church declared Olaf a saint in 1164.

Saint Olaf, also called Olaf the Holy, Olaf II, Olaf Haraldsson, and Olaf the Stout or "Large", was King of Norway from 1015 to 1028. Son of Harald Grenske, a petty king in Vestfold, Norway, he was posthumously given the title Rex Perpetuus Norvegiae and canonised at Nidaros (Trondheim) by Bishop Grimketel, one year after his death in the Battle of Stiklestad on 29 July 1030. His remains were enshrined in Nidaros Cathedral, built over his burial site. His sainthood encouraged the widespread adoption of Christianity by Scandinavia's Vikings/Norsemen.