Monarchy of Norway in the context of "Petty kingdoms of Norway"

The Icelandic Commonwealth, also known as the Icelandic Free State, was the political unit existing in Iceland between the establishment of the Althing (Icelandic: Alþingi) in 930 and the pledge of fealty to the Norwegian king with the Old Covenant in 1262. With the probable exception of hermitic Irish monks known as Papar, Iceland was an uninhabited island until around 874.

The Icelandic Commonwealth had a unique political system whereby chieftains (goðar) established a common legal code and settled judicial disputes at the Althing, a national assembly. However, there was no executive body in Iceland that enforced the legal code. The Icelandic Commonwealth has consequently been characterized as a stateless society. During the 13th century, Iceland came under the control of the Kingdom of Norway.

Harald Fairhair (Old Norse: Haraldr Hárfagri; c. 850 – c. 932) was a Norwegian king. According to traditions current in Norway and Iceland in the eleventh and twelfth centuries, he reigned from c. 872 to 930 and was the first King of Norway. Supposedly, two of his sons, Eric Bloodaxe and Haakon the Good, succeeded Harald to become kings after his death.

Much of Harald's biography is uncertain. A couple of praise poems by his court poet Þorbjörn Hornklofi survive in fragments, but the extant accounts of his life come from sagas set down in writing around three centuries after his lifetime. His life is described in several of the Kings' sagas, none of them older than the twelfth century. Their accounts of Harald and his life differ on many points, but it is clear that in the twelfth and thirteenth centuries Harald was regarded as having unified Norway into one kingdom.

The Church of Norway (Bokmål: Den norske kirke, Nynorsk: Den norske kyrkja, Northern Sami: Norgga girku, Southern Sami: Nöörjen gærhkoe) is an evangelical Lutheran denomination of Protestant Christianity and by far the largest Christian church in Norway. Christianity became the state religion of Norway around 1020, and was established as a separate church intimately integrated with the state as a result of the Lutheran reformation in Denmark–Norway which broke ties with the Holy See in 1536–1537; the Norwegian monarch was the church's titular head from 1537 to 2012. Historically, the church was one of the main instruments of state authority, and an important part of the state's administration. Local government was based on the church's parishes with significant official responsibility held by the parish priest.

In the 19th and 20th centuries, the Church of Norway gradually ceded most administrative functions to the secular civil service. The modern Constitution of Norway describes the church as the country's "people's church" and requires the monarch to be a member. It is by far the largest church in Norway; until the mid 19th century the state church had a near-total monopoly on religion in Norway. It was the only legal church in Norway, membership was mandatory for every person residing in the kingdom and it was forbidden for anyone other than the official priests of the state church to authorise religious meetings. After the adoption of the 1845 Dissenter Act, the state church retained its legally privileged position, while minority religious congregations such as Catholics were allowed to establish themselves in Norway and were legally termed "dissenters" (i.e. from the government-sanctioned Lutheran state religion). Church employees were civil servants from the Reformation until 2017, when the church became a legal entity separate from the state administration. The Church of Norway is mentioned specifically in the 1814 constitution and is subject to the Church Act. Municipalities are required by law to support activities of parishes and to maintain church buildings and churchyards. Other religious communities are entitled to the same level of government subsidies as the Church of Norway.

The list of monarchs of Norway (Norwegian: kongerekken or kongerekka) begins in 872: the traditional dating of the Battle of Hafrsfjord, after which victorious King Harald Fairhair merged several petty kingdoms into that of his father. Named after the homonymous geographical region, Harald's realm was later to be known as the Kingdom of Norway.

Traditionally established in 872 and existing continuously for over 1,100 years, the Kingdom of Norway is one of the oldest states of Europe: King Harald V, who has reigned since 1991, is the 64th monarch according to the official list. During interregna, Norway has been ruled by variously titled regents.

The line of succession to the Norwegian throne consists of people entitled to become head of state of Norway.

The succession is currently governed by Article 6 of the Constitution, altered most recently in 1990 to introduce absolute primogeniture among the grandchildren and further eligible descendants of King Harald V. The King's children are ranked according to male-preference cognatic primogeniture, which was given between 1971 and 1990; Crown Prince Haakon and his eligible descendants thus take precedence over his older sister, Princess Märtha Louise, and her eligible descendants.

A chamberlain (Medieval Latin: cambellanus or cambrerius, with charge of treasury camerarius) is a senior royal official in charge of managing a royal household. Historically, the chamberlain superintends the arrangement of domestic affairs and was often also charged with receiving and paying out money kept in the royal chamber. The position was usually awarded as an honour to a high-ranking member of the nobility (nobleman) or the clergy, often a royal favourite. Roman emperors appointed this officer under the title of cubicularius. The Chamberlain of the Holy Roman Church enjoys very extensive powers, having the revenues of the papal household under his charge. As a sign of their dignity, chamberlains bore a key, which in the seventeenth century was often silvered, and actually fitted the door-locks of chamber rooms. Since the eighteenth century, it has turned into a merely symbolic, albeit splendid, rank-insignia of gilded bronze. In many countries there are ceremonial posts associated with the household of the sovereign.

The civil war era in Norway (Norwegian: borgarkrigstida, borgarkrigstidi, borgerkrigstida or borgerkrigstiden) began in 1130 and ended in 1240. During this time in Norwegian history, some two dozen rival kings and pretenders waged wars to claim the throne.

In the absence of formal laws governing claims to rule, men who had proper lineage and wanted to be king came forward and entered into peaceful, if still fraught, agreements to let one man be king, set up temporary lines of succession, take turns ruling, or share power simultaneously. In 1130, with the death of King Sigurd the Crusader, his possible half-brother, Harald Gillekrist, broke an agreement that he and Sigurd had made to pass the throne to Sigurd's only son, the bastard Magnus. Already on bad terms before Sigurd's death, the two men and the factions loyal to them went to war.