Charles XIV John

After the death of the heir apparent, the Swedish Riksdag elected French Marshal Jean-Baptiste Bernadotte as Crown Prince. He was adopted by King Charles XIII. This unexpected choice was driven by a desire for a strong military leader to secure Sweden's interests against Russia and Napoleon.

As Crown Prince, Charles John (Bernadotte) led Sweden into the Sixth Coalition against Napoleon. He commanded the Swedish army and the Northern Army of the Coalition. His decision to join the allies was crucial in tipping the balance against Napoleon and securing Sweden's post-war position.

As a result of the Treaty of Kiel, Sweden forced Denmark to cede Norway. Charles John then led a military campaign to enforce the union, culminating in the Convention of Moss. Norway entered a personal union with Sweden under King Charles XIII, with Charles John as de facto ruler.

Upon the death of King Charles XIII, Bernadotte ascended the throne as Charles XIV John of Sweden and Norway. He founded the House of Bernadotte, which continues to reign in Sweden. His reign marked the beginning of a long period of peace and neutrality for Sweden.