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'Apostolic King' was a hereditary title borne by the King of Hungary. Saint Stephen (''ca'' 975–1038) is supposed to have received it from Pope Sylvester II — his efforts to Christianize his people led to his comparison to one of the apostles. It was first used by the Holy Roman Emperor Leopold I (1657–1705) as King of Hungary. The title was last used in the reign of Charles IV (1916–18).
The introduction of this title is a parallel with Spain's Catholic and France's Most Christian King.