|←Author Index: Gr||Pope Gregory IX
|Born Ugolino di Conti, pope from 1227 to 1241.|
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Works about Pope Gregory
- "Gregory IX." in the Encyclopædia Britannica, 9th ed. 1880.
- "Gregory IX." in the Encyclopædia Britannica, 11th ed. 1911.
- “Pope Gregory IX,” in Catholic Encyclopedia, 1913.
Works by this author published before January 1, 1923 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.