Christian August Selmer was a Norwegian lawyer and a magistrate. He served as a member of the Norwegian Parliament, Minister of Defense and Minister of Justice. He was the 2nd prime minister of Norway in Christiana between 1880 and 1884.

Halden, between 1665 and 1928 known as Fredrikshald, is both a town and a municipality in Østfold county, Norway. The municipality borders Sarpsborg to the northwest, Rakkestad to the north and Aremark to the east, as well as the Swedish municipalities Strömstad, Tanum and Dals-Ed respectively to the southwest, south and southeast.