Jean Baptiste Bernadotte (Pau, January 26, 1763 - Stockholm, March 8, 1844) is known as a French marshal who served in the XIV. Sweden under the name János Károly and III. He reigned as King of Norway between 1818 and 1844 under the name János Károly. He was the founder of the Bernadotte ruling house. He came from a French petty-bourgeois family and fought successfully in the French Republic and Napoleonic Wars. In 1810, the aged and heirless XIII. He was chosen as the heir to the throne of King Charles of Sweden and thus came to the Swedish and Norwegian thrones. During his reign, he was ultra-conservative and governed his countries in an absolutist manner. After the victory, he acquired Norway from Denmark, and the two countries remained in personal union until 1905. He rests in Riddarholmskyrkan as XIV. King Charles John of Sweden. In 1812, he joined the Sixth Coalition against Napoleon. Napoleon married his first bride, Désirée Clary. He had only one son, Duke Oszkár, later King Oszkár I.

XIV. King John Károly ruled Norway and Sweden from 1818 to 1844. During his reign, the coinage of the two countries changed significantly. In Sweden, he replaced the previous gold and silver coins with uniform coins, the riksdaler. From 1825, the riksdaler was made of silver and was divided into 100 öre. In addition to the riksdaler, copper coins of 10, 5 and 2.5 öre also appeared at the beginning of the century. In Norway, János Károly also replaced the previous silver coins with riksdaler. From 1818, the riksdaler was also made of silver in Norway and was divided into 100 kroner. In addition to the riksdaler, copper coins of 10, 5 and 2.5 öre appeared at the beginning of the century. During the reign of János Károly, the technology of coinage also developed. The previous manual mints were replaced by the steam press, which made it possible to produce larger quantities and better quality coins. In the minting, János Károly also paid a lot of attention to the artistic design. The portrait of the king or the Swedish and Norwegian coats of arms often appeared on the back of the medals. During the reign of János Károly, the coinage of the two countries became unified, and the riksdaler became the common currency. This contributed to strengthening the economic and political unity of the two countries.