Hannibal Sehested (governor)
Hannibal Sehested (1609 – 23 September 1666) was a Dano-Norwegian statesman and son-in-law of King Christian IV. He served as Governor-general of Norway from 1642 to 1651, where he fought the Torstenson War against Sweden and implemented many reforms. After a fall from grace leading to his resignation as Governor-general in 1651, he regained the trust of Frederick III in 1660 and negotiated the Treaty of Copenhagen. He worked as lord treasurer and councillor of state until his death in 1666. 
Sehested was born at Arensborg Castle on Øsel, in Danish Estonia, as the son of Claus Maltesen Sehested (1558-1612) and Anne Nielsdatter Lykke (1568-1645). He was named after his maternal uncle Hannibal Mogensen Gyldenstjerne of Restrup. He attended the Sorø Academy from 1626 to 1629, and then studied abroad in Germany, Holland, France and England from 1629 to 1639. After completing his education abroad, he returned to Denmark and was attached to the court of King Christian IV. In 1639 he was granted the fiefdom of Tranekær, and in 1640 he received the far more lucrative Båhus fiefdom in Norway and was also appointed member of the Danish National Council.
In 1640 and 1641 he was sent to Wismar to negotiate a treaty with the Swedish chancellor, Axel Oxenstierna, and, if possible, to bring about the marriage of Christian's son Frederick and Gustavus Adolphus's daughter Christina. Though failing in both particulars, he retained the favor of the king, who had marked him out as a son-in-law, one of seven by whose influence he hoped to increase the influence of the crown. Accordingly, in 1636 he was betrothed to one of the daughters, the countess Christine, then aged nine, whom he married in 1642.
In May 1640, Sehested became a member of the Rigsråd. He believed that the proper field for the exercise of his talents was diplomacy, and he openly aspired to be minister of foreign affairs. Despite a successful embassy to Spain in 1640-1641, he did not obtain the coveted post, but was appointed Governor-General of Norway.
Governor-general of Norway under Christian IV
In April 1642 he was appointed Governor-General of Norway, where he served until 1651. He now had the opportunity of displaying his administrative and organizing abilities, united with a remarkable zeal for reform. He made it his main objective to develop Norway's material resources, reorganize her army, fortifications and fiscal system; and he aimed at giving her a more independent position in the union with Denmark.
The Hannibal War
During Christian IV's second war with Sweden (1643–1645), Sehested, as governor of Norway, assisted his father-in-law materially. He invaded Sweden four times; successfully defended Norway from attack; and, though without any particular military talent, won an engagement at Nysaker in 1644. The war was unpopular with Norway and was referred to in Norway as the Hannibal war. Concerns centered around high taxes required to support the army and the concern that Sweden would be induced to invade Norway. Although Norwegian forces suffered no defeats, as part of the peace settlement, Jemtland and Herjedalen, both formerly Norwegian, were ceded to Sweden by Denmark with Sehested's acquiescence.
After the war he renewed his reforming efforts, and during the years 1646-1647 strove to withdraw his governorship from the benumbing influence of the central administration at Copenhagen, and succeeded with the help of Christian IV in creating a separate defensive fleet for Norway and giving her partial control of her own finances. He was considerably assisted in his endeavours by the fact that Norway was regarded as the hereditary possession of the kings of Denmark. 
Fall from favor
At the same time, Sehested freely used his immense wealth and official position to accumulate for himself property and privileges of all sorts. His successes finally excited the envy and disapprobation of the Danish Rigsraad, especially of his rival, Korfits Ulfeldt, also one of the king's sons-in-law. The quarrel became acute when Sehested's semi-independent administration of the finances of Norway infringed upon Ulfeldt's functions as lord treasurer of the whole realm. In November 1647, Ulfeldt carried his point, and a decree was issued that henceforth the Norwegian provincial leaders should send their rents and taxes direct to Copenhagen. 
Governor-general of Norway under Frederick III
On the accession of Frederick III (1648) to the throne, Sehested strove hard to win his favor, but an investigation into his accounts as governor conducted by his enemies brought to light such wholesale embezzlement and peculation that he was summoned to appear before a herredag, or assembly of notables in May 1651 to give an account of his whole administration. Unable to meet the charges brought against him, he compromised matters by resigning his governorship and his senatorship, and surrendering all his private property in Norway to the crown. 
After the fall
Throughout his trial, Sehested had shown prudence. He gave back three times what he had embezzled. Calculating on the sympathy of Frederick III for a man of his monarchical tendencies, he had nothing to do with the projects of revenge which were the ruin of Korfits Ulfeldt. From 1651 to 1660, he lived abroad. At the end of 1655, he met the exiled Charles II of England at Cologne and lived a part of the following year with him in the Spanish Netherlands. In the summer of 1657, he returned to Denmark, but Frederick III refused to receive him, and he hastily quit Copenhagen. During the crisis of the Second Northern War of 1658, he was at the headquarters of Charles X of Sweden. In seeking the help and protection of the worst enemy of his country, Sehested approached the very verge of treason, but he never quite went beyond it. When, at last, it seemed probable that the war would not result in the annihilation of Denmark, Sehested strained every nerve to secure his own future by working in the interests of his native land while still residing in Sweden. 
The final years
In April 1660, he obtained permission from Frederick III to come to Copenhagen and was finally instructed by him to negotiate with the Swedes. The Treaty of Copenhagen, which saved the honour of Denmark and brought her repose, was very largely Sehested's work. He was one of the willing abettors of Frederick III during the emergencyof 1660, when he re-entered the Danish service as lord treasurer and councilor of state. Both at home and on his frequent foreign missions, he displayed all his old ability. He was challenged by new rivals like Kristoffer Gabel and his influence seems to have been somewhat fading during his last years but he remained in office until his death.  As a diplomat, he in some ways anticipated the views of Peter, count Griffenfeldt, supporting the policy of friendship with Sweden and a French alliance. He died suddenly in Paris, where he was conducting important negotiations. His political testament is perhaps the best testimony to his liberal and statesmanlike views. 
- Rian, Øystein. "Hannibal Sehested". Norsk biografisk leksikon (in Norwegian). Retrieved 27 July 2012.
- Bricka, Carl Frederik (1887–1905). "Hannibal Sehested". Dansk biografisk leksikon (in Danish). Retrieved 27 July 2012.
- "Hannibal Sehested". lokalhistoriewiki.no/. Retrieved September 1, 2018.
- Erik Opsahl. "Hannibal Sehested". Store norske leksikon. Retrieved September 1, 2018.
- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press. which in turn cites:
- Thyra Sehested, Hannibal Sehested (Copenhagen, 1886)
- Julius Albert Fridericia, Adelsvældens sidste Dage (Copenhagen, 1894)
- Carl Olaf Bøggild Andersen (1946) Hannibal Sehested: en dansk statsmand (Universitetsforlaget i Århus)