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Hint
Years in power
Answer
Had his predecessor exhumed, tried, de-fingered, and thrown to the river
896-897
Stephen VI
Ordered the murder of another pope and the only known to have fathered an illegitimate son who later became pope
897-911
Sergius III
Aged only 18 when elected pope, he raped female pilgrims, consecrated a 10-year-old boy as bishop, invoked pagan gods, gave land to a mistress, and was killed by a man who caught him in bed with his wife.
955-964
John XII
Split the church's finances among his relatives
985-966
John XV
Gave up his papacy twice in exchange for a large sum of money
1032-1044 and 1047-48
Benedict IX
Approved the use of torture to extract confessions of heresy
1243-54
Innocent IV
Complained he not hear enough screaming when Cardinals who had conspired against him were tortured
1378-89
Urban VI
Took Italy by force, fathered at least seven, and possibly as many as ten illegitimate children, and threw large parties, bordering on orgies
1492-1503
Alexander VI
Also a Medici, whose power-politicking with France, Spain, and Germany got Rome sacked.
1523-34
Clement VII
Sold indulgences to reconstruct St. Peter's Basilica and had cardinals assassinated