In May
1813, being the then heir presumptive of Denmark-Norway, he was sent as
stattholder (the Danish King's highest representative in overseas territories) to
Norway to promote the loyalty of the Norwegians to the dynasty, which had been very rudely shaken by the disastrous results of
Frederick VI's adhesion to the falling fortunes of
Napoleon I of France. He did all he could personally to strengthen the bonds between the Norwegians and the royal house of Denmark. Though his endeavours were opposed by the so-called Swedish party, which desired a dynastic union with
Sweden, he placed himself at the head of the Norwegian party of independence after the
Treaty of Kiel had forced the king to cede
Norway to the king of Sweden. He was elected Regent of Norway by an assembly of notables on
February 16, 1814.
See article on Norway in 1814
This election was confirmed by a constitutional assembly convoked at
Eidsvoll on
April 10, and on
May 17 the constitution was signed and Christian was unanimously elected king of Norway, under the name Christian Frederick.
Christian next attempted to interest the great powers in Norway's cause, but without success. On being pressed by the commissioners of the allied powers to bring about a union between Norway and Sweden in accordance with the terms of the treaty of Kiel, and then return to Denmark, he replied that, as a constitutional king, he could do nothing without the consent of the parliament (
Storting), which would not be convoked until a suspension of hostilities on the part of Sweden.
Sweden refusing Christian's conditions, a short campaign ensued, in which the Norwegian army was defeated by the forces of the Swedish crown prince
Charles John. The brief war was finally concluded by the
Convention of Moss on
August 14, 1814. According to this treaty, king Christian Frederick transferred the executive power to the
Storting, and then abdicated and returned to Denmark. The Storting in its turn adopted the constitutional amendments necessary to allow for a personal union with Sweden, and on
November 4 elected
Charles XIII of Sweden as the new king of Norway.