Author:Gregory IV

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Gregory IV
(c. 790 – 844)
pope from December 20, 827 to January 11, 844
Gregory IV


Works about Gregory IV[edit]

  • "Gregory IV." in the Encyclopædia Britannica, 9th ed. 1880.
  • "Gregory IV." in the Encyclopædia Britannica, 11th ed. 1911.

Works by this author published before January 1, 1924 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.