Upon the death of King Oscar I, his son, Charles XV, ascended to the throne as the King of Sweden and IV of Norway. Born on May 3, 1826, Charles XV was educated in a manner that distinguished him as a cultured and modern monarch, with a keen interest in the arts and sciences. The dual ascension took place in Stockholm, Sweden, where Charles was officially proclaimed king amid grand festivities. Charles's reign was characterized by efforts to foster a sense of national unity between the two countries at a time when various nationalistic movements were gaining traction across Europe.

Charles XV adopted a policy of active involvement in cultural matters, endorsing various artistic endeavors, and advocating for education reform. He was known for his progressive views and aimed to promote a sense of shared identity among the Swedish and Norwegian peoples. His reign also coincided with significant political changes, including an emphasis on constitutional governance and the strengthening of parliamentary systems.

The ceremonies surrounding his coronation were accompanied by public celebrations that included military parades, artistic performances, and gatherings that demonstrated civic pride. In Norway, the accession was celebrated with similar enthusiasm, highlighting the dual nature of the monarchy. Charles XV's leadership style was seen as an embodiment of modern monarchal ideals, balancing tradition with the need for progressive reforms.