During the Napoleonic Wars, his connections with Sweden increased, and when the appointed and adopted Swedish crown prince, Carl August died in 1810, his name was mentioned as a possible substitute in a desperate situation. Jean Baptiste Bernadotte was appointed and adopted and changed his name to Carl Johan. Wedel Jarlsberg was elected to the National Assembly at Eidsvold in April-May 1814 as representative of the County of Jarlsberg. His engagement for a Norwegian union with Sweden did not diminish. He maintained strongly that Norwegian interests were often contrary to the Danish, and that after the Swedes had adopted a constitution in 1809, Norwegian interests would be more strongly secured in a union with that country. He was of course well aware of the Swedish campaign to incorporate Norway as a substitution for the lost Finnish provinces. In some popular works Count Wedel Jarlsberg has been described as a traitor – a fifth-columnist – which is completely unjust. His opinions were well known to the educated public, and even if he was politically isolated to some extent, his title and position in the Norwegian society never changed much. During Norway's efforts to secure independence from Denmark and Sweden in 1814, he hence advocated a moderate approach to the issue. He was the obvious leader of the party which has been named "the Union Party"or "the Swedish Party". He maintained that Norway would not manage to stand completely alone, alienated from all the leading powers in Europe, which had unanimously guaranteed Norway as a Swedish province. But there is no evidence that his point of view in any sense prevented him from fighting for a Norwegian constitution inspired by those of the United States and France, which the Swedish constitution was not. He belonged to the minority in the main topic on the Constitutional Assembly at Eidsvoll, but he was vindicated by subsequent events. He was made Minister of Finance in 1814 and served in this role until 1822. His efforts to restore a Norwegian monetary policy were successful, and he was without contest as the leading force of the government – even with Swedish governors as the formal leaders of the cabinet. His relations with King Carl Johan had at that time cooled to a point where close cooperation was no longer possible. He was elected to Stortinget in 1824, where he served until 1832. He was president of Parliament twice, in 1824 and 1830, and in 1836, after relations with the king had improved again, he was appointed governor and held that post until his death at Wiesbaden in 1840. The choice of him as governor was a popular one. He was almost unanimously respected because of his obvious political and administrative talents. His status as a nobleman in a country where nobility had been abolished as early as in 1821, did not diminish Norwegian affection for him. It is beyond doubt that his contributions to diminish the rather aggressive relations between the Parliament – the Storting – and King Carl Johan were decisive.
Personal life
Wedel Jarlsberg was married to Karen Anker, the only child of prime minister Peder Anker. From her family he inherited a vast fortune, consisting mostly of the forests around Christiania – present dayOslo. At the death of his father-in-law Peder Anker in 1824, Wedel also inherited Bogstad gård, Vækerø gård and Bærums Verk. In 1812, Johan Caspar Herman Wedel Jarlsberg rebuilt the manor house at Jarlsberg in the empire style. Around the manor there were arranged big, but simple garden and parks areas.
