Possible Clues:

• "Great" pope
• Pope, 440-461
• He was succeeded by his archdeacon Hilarius
• First in a string of 13 Popes
• First of a string of 13 popes
• First ''Great'' pope
• Pope after Sixtus III
• Earliest pope to receive the title 'the Great'
• First of 14 popes
• First pope with the title 'the Great'