query: Who was the last King of Sweden?
passage: Carl XVI Gustaf of Sweden
Carl XVI Gustaf[lower-alpha 1] (Carl Gustaf Folke Hubertus; born 30 April 1946) is the King of Sweden. He ascended the throne on the death of his grandfather, King Gustaf VI Adolf, on 15 September 1973.
passage: Gustav, Duke of Zweibrücken
In Swedish politics, Duke Gustav was the last male of the line of his paternal grandmother, Katarina Vasa. Upon the death of his cousin King Charles XII, Gustav of Stegeborg then became one of the eligible candidates for legitimate succession to the thrones of Sweden and of the grand duchy of Finland. He would have become king Gustav III, had he succeeded. However, no strong faction or party in Sweden took up his cause, and his succession rights are not much remembered by history. Instead, his cousin Ulrica Eleonora managed to become the Swedish queen regnant.