Yes, there have been popes who served while their parents were still alive. It is difficult to say with many of the ancient popes as little is written about their lives. One pope in particular, the notorious Benedict IX, was only about 18 years old at the time his father purchased the papacy for him.
During his reign as pope he visited 129 countries.
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)
Apparently, Pius V did not canonize any saints during his reign as pope.
Because the papacy grew in importance after his election
He was born in Rome ~ sorry if this isn't specific enough, but it's all I know!
During the reign of Constantine I (the Great, 306-337) the popes were: Marcellus I (308-309), Eusebius (309-310) Miltiades (311-314), Sylvester I (314-335), Mark (330), and Julius I (337-352). Between 304 and 308 there was an interregnum, a period where there was not a pope.
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.
That would probably be dictated by his own personal preference during his reign.
Pope Gregory IV ruled from 827 to January 844.
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.
There have been 266 popes and each one accomplished different things during their reign. Pleae be specific.
He beatified 1,340 people and canonized 483 saints.