High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Pope Innocent IV, born Sinibaldo Fieschi (c. 1195 - 7 December 1254) was pope from 28 June 1243 until his death. Before his elevation to the papacy Sinibaldo was Vice-Chancellor of the Holy Roman Church (1226-1227), being created Cardinal Priest of San Lorenzo in Lucina on (September 18, 1227) by Pope Gregory IX, later serving as governor of the March of Ancona (1235 until 1240).