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|←Author Index: Gr||Gregory IX
(12th century – 1241)
|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, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)