The alleged story of the crown and papal legate authority given to Stephen I of Hungary by Sylvester in the year 1000 (hence the title 'Apostolic King') is noted by the 19th-century historian Lewis L. Kropf as a possible forgery of the 17th century.
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This title was renewed by Pope Clement XIII in 1758 in favor of the Holy Roman Empress Maria Theresia, Queen of Hungary, and her descendants, the later Habsburg Emperors of Austria, bore the title of apostolic king of Hungary, used by the King himself, as also in the letters addressed to him by officials or private individuals.
Franz Joseph I of Austria (1830–1916), Emperor of Austria, Apostolic King of Hungary and King of Bohemia