Councillor
Two years later Petersen accepted to become councillor of state in the Second Wedel Government (1836-1844), and was appointed chief of the Ministry of the Navy in October 1839. Apart from two periods at the Norwegian Council of State Division in Stockholm, he was chief of the Ministry of the Navy for the rest of this period.
During the Løvenskiold/Vogt Government (1844-1856) Petersen alternated between service at the Council of State Division in Stockholm and the responsibility as chief of the Ministries of the Navy, Justice, the Interior and the Army.
During the Vogt Government (1856-1858) Petersen alternated between the Council of State Division in Stockholm and the Ministries of the Army, the Navy and Justice. In early December 1858 he succeeded Jørgen Vogt as first minister in Christiania.
During the Sibbern/Birch/Motzfeldt Government (1858-1861) Petersen continued as the First Minister in Christiania. He now alternated between the responsibility as chief of the Ministries of Justice, the Navy and Auditing.
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