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In page Pope Celestine IV:

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Only on 25 October 1241 was the cardinal bishop of Sabina finally elected by the required two-thirds majority, seven cardinals out of ten. He took the name Pope Celestine IV, but occupied the throne for only seventeen days. It is said that this was nevertheless long enough for him to proceed, as his only significant act, with the excommunication of Matteo Rosso Orsini.[8] This assertion is disputed, it being said that in fact, Orsini continued as Senator of Rome in 1242 and was Senator when Innocent IV (Fieschi) was elected; and that his son (the future Nicholas III) was made a cardinal in 1244.[9] In any event, Celestine IV died before he could be crowned, on 10 November 1241,[10] of fatigue and old age, and was entombed in Saint Peter's Basilica.[citation needed]