/ · 1907 Nuttall Encyclopædia of General Knowledge · C · Calixtus
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Calixtus, the name of three Popes: C. I., Pope from 218 to 222; C. II., Pope from 1119 to 1124; C. III., Pope from 1455 to 1458.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)