Pope Gregory IV ruled from 827 to January 844.
The 111th pope was Pope Stephen VI who reigned from 885 until 891.
It would only be short if the pope either died or resigned early in his reign. A pope is elected for life and some popes have been in office for over 30 years.
Innocent was pope number 40. His reign started December 22, 401, and ended on March 12, 417.
5 years, 701, A.D. to 705 A.D.
Because the papacy grew in importance after his election
Pope John Paul II who was chosen as pope in 1978 was from Poland.
That little secret is known only by God. A lot can happen during the remaining years of the reign of Pope Francis so it is impossible to speculate.
Depending on which Pope John Paul.... Pope John Paul I was the pope for only about 33-34 days (about a month) from August 26 1978 to September 28 1978 Pope John Paul II was pope for about 25 years, only a few months short of 26 years. His reign was from October 16, 1978 to April 2, 2005
Pope Stephen IV followed the reign of Leo III.
During his reign as pope he visited 129 countries.
Pope Francis has not been succeeded at the time of this answer.
There were three popes during Queen Victoria's reign (1837-1901): Pope Gregory XVI (1831-1846) Pope Pius IX (1846-1878) Pope Leo XIII (1878-1903)