|←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.