The name of five Popes: C. I., Pope from 422 to 432; C. II., Pope from 1143 to 1144; C. III., Pope from 1191 to 1198; C. IV., Pope for 18 days in 1241; C. V., Pope in 1294, a hermit for 60 years; nearly 80 when elected against his wish; abdicated in five months; imprisoned by order of Boniface VIII.; d. 1296; canonised 1313.