Question: Óttarr svarti ("Óttarr the Black") was an 11th-century Icelandic skald, he was the last court poet, finally of which King of Denmark, England and Norway; together often referred to as the North Sea Empire?

Context paragraphs:
Kormákr Ögmundarson: Kormákr Ögmundarson was a 10th-century Icelandic skald.  He is the protagonist of "Kormáks saga" which preserves a significant amount of poetry attributed to him.  According to "Skáldatal" he was also the court poet of Sigurðr Hlaðajarl and fragments of a "drápa" to the jarl are preserved in "Skáldskaparmál".

Sigvatr Þórðarson: Sigvatr Þórðarson (Sighvatr Þórðarson, Sigvat Tordarson) or Sigvat the Skald (995-1045) was an Icelandic skald.  He was a court poet to King Olaf II of Norway, as well as Canute the Great, Magnus the Good and Anund Jacob, by whose reigns his floruit can be dated to the earlier eleventh century.  Sigvatr was the best known of the court skalds of King Olaf and also served as his marshal ("stallare").

Þórðr Sjáreksson: Þórðr Sjáreksson was an 11th-century Icelandic skald.  He composed a "drápa" on Þórólfr Skólmsson, four strophes of which have been preserved in the kings' sagas.  He also composed a memorial "drápa" on the canonised Olaf II of Norway, called "Róðadrápa" ("Drápa of the Rood"), one strophe of which is preserved.  A few disjoint strophes by Þórðr on different subjects are also preserved in "Skáldskaparmál". " Skáldatal" reckons Þórðr among the court poets of both Óláfr Haraldsson and Eiríkr Hákonarson.

Þórðr Kolbeinsson: Þórðr Kolbeinsson ("Thordr Kolbeinsson") was an 11th-century Icelandic skald, or poet.  He was the court poet of Eiríkr Hákonarson and some 17 stanzas of his poetry on the earl are preserved in the kings' sagas.  The following example is from Eiríkr's campaign in England with Canute the Great.

Óláfr Leggsson: Óláfr Leggsson was a 13th-century Icelandic skald.  He is usually referred to as Olafr Svartaskald (black skald) to distinguish him from his contemporary, Olafr Thordarson, "hvitaskald" (white skald).

Þórarinn Skeggjason: Þórarinn Skeggjason was an 11th-century Icelandic skald.  According to "Skáldatal", he was a court poet of the Norwegian king Harald Hardrada.  He composed a "drápa" on the king.  Only one half-stanza of it has been preserved in the kings' sagas.  It tells that Harald blinded the Byzantine emperor Constantine Monomachos.  This episode is also mentioned by Þjóðólfr Arnórsson in his "Sexstefja".

Battle of Nesjar: Battle of Nesjar ("Slaget ved Nesjar") was a sea battle off the coast of Norway in 1016.  It was a primary event in the reign of King Olav Haraldsson (later Saint Olav).  Icelandic skald and court poet Sigvatr Þórðarson composed the poem "Nesjavísur" in memory of the battle.

Knútsdrápa (Óttarr svarti): The Knútsdrápa by the skald Óttarr svarti (Óttar the Black) is one of the Old Norse poems composed for King Cnut. " Knútsdrápur" (plural of "Knútsdrápa") are Old Norse skaldic compositions in the form of "drápur" which were recited for the praise of Cnut.  Most of Óttarr's poem is cited in the "Knýtlinga saga", while one stanza is known only from other sources such as the "Heimskringla".  It has been debated whether strophe 9 truly belongs to Óttarr's "Knútsdrápa" or to a poem which Óttarr composed for Cnut's father Svein Haraldsson.

Óttarr svarti: Óttarr svarti ("Óttarr the Black") was an 11th-century Icelandic skald.  He was the court poet first of Óláfr skautkonungr of Sweden, then of Óláfr Haraldsson of Norway, the Swedish king Anund Jacob and finally of Cnut the Great of Denmark and England.  His poems are significant contemporary evidence for the careers of Óláfr Haraldsson and Cnut the Great.

Cnut the Great: Cnut the Great (Old Norse: "Knútr inn ríki"; c. 995 – 12 November 1035), also known as Canute - whose father was Sweyn Forkbeard (which gave him the patronym "Sweynsson", Old Norse: "Sveinsson") - was King of Denmark, England and Norway; together often referred to as the North Sea Empire.  With the deaths of his heirs within a decade of his own, and Norman conquest of England in 1066, this legacy was mostly forgotten.  He is popularly invoked in the context of the legend of "King Canute and the waves", which usually misrepresents him as a deluded monarch believing he has supernatural powers, contrary to the original legend which portrays a wise king who rebuked his courtiers for their fawning behaviour.

Supporting paragraphs: Óttarr svarti Cnut the Great
Answer: Cnut the Great