Charles XIV John was King of Sweden and Norway from 1818 until his death in 1844 and the first monarch of the Bernadotte dynasty. In Norway, he is known as Charles III John and before he became royalty in Sweden, his name was Jean-Baptiste Jules Bernadotte. During the Napoleonic Wars, he participated in several battles as a Marshal of France.

The monarchy of Sweden is centred on the monarchical head of state of Sweden, by law a constitutional and hereditary monarchy with a parliamentary system. There have been kings in what now is the Kingdom of Sweden for more than a millennium. Originally an elective monarchy, it became a hereditary monarchy in the 16th century during the reign of Gustav Vasa, though virtually all monarchs before that belonged to a limited and small number of political families which are considered to be the royal dynasties of Sweden.