:" The first pope who used it in an official act and relied upon it, was Leo IX ; in a letter of 1054 to Michael Cærularius, Patriarch of Constantinople, he cites the " Donatio " to show that the Holy See possessed both an earthly and a heavenly imperium, the royal priesthood.

:" The first pope who used it in an official act and relied upon it was Leo IX ; in a letter of 1054 to Michael Cærularius, Patriarch of Constantinople, he cites the " Donatio " to show that the Holy See possessed both an earthly and a heavenly imperium, the royal priesthood.

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