Carl XVI Gustaf (Carl Gustaf Folke Hubertus; born 30 April 1946) is King of Sweden. Having reigned since 1973, he is the longest-reigning monarch in Swedish history. Carl Gustaf was born during the reign of his paternal great-grandfather, King Gustaf V, as the youngest child and only son of Prince Gustaf Adolf, Duke of Västerbotten, and Princess Sibylla of Saxe-Coburg and Gotha. His father died in an airplane crash in Denmark in January 1947, when Carl Gustaf was nine months old.
https://en.wikipedia.org/wiki/Carl_XVI_Gustaf