I am Carlos Rex also known as Charles XII. i am Charles XII (17 June 1682 – 30 November 1718, reigned from 5 April 1697 to 30 November 1718), perhaps better known outside Sweden as Carolus Rex (latinized form of King Charles) was a King of Sweden full title . Amongst the various Notable Swedish Monarchs, Charles XII was one of a kind: The only surviving son of the previous King, Carolus (crowned king when he was fifteen) soon saw himself in a time of great political strife between his nation.