Possible Clues:

• Pope before Paul V
• 17th-century pope
• Successor to Clement VIII
• Pope of 1605
• Pope whose pontificate lasted less than one month in 1605
• Eleventh of 13 popes
• 27-day pope of 1605
• April 1605 pope
• 10th-century pope
• Pope with a 27-day pontificate