Karelius August Arntzen was a Norwegian

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

 politician.

He was born in Copenhagen

Copenhagen

Copenhagen is the capital and largest city of Denmark, with an urban population of 1,199,224 and a metropolitan population of 1,930,260 . With the completion of the transnational Øresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Øresund Region...

, where his father Andreas Arntzen

Andreas Arntzen

Andreas Arntzen was a Norwegian politician.He was born in Grue, and graduated as cand.jur. in Copenhagen in 1802. He then worked as an attorney, chief of police of Christiania, Supreme Court judge and also timber merchant....

 took his jurist education. He moved to his father's home country Norway in 1821, and graduated as cand.jur. in 1827. He then worked as a civil servant for some time.

He was later County Governor of Søndre Trondhjems Amt (today named Sør-Trøndelag

Sør-Trøndelag

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) from 1840 to 1857, and of Christiania (Oslo

Oslo

Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

) from 1857 to 1874. He died in 1876.

He was appointed acting councillor of state in the interim government which was founded during King Carl XV's illness in 1861, but did not actually assume office.