Possible Clues:

• 'Great' pope of 440-61
• He persuaded the Huns not to attack Rome
• Certain canonized pope
• Fifth century pope known as "The Great"
• Fifth-century pope, the first to receive the title 'the Great'
• Pope of 452 who met with Attila
• Fifth-century pope who convinced Attila not to march on Rome
• Pope of the fifth century
• Pope remembered on Nov. 10
• Fifth-century pope known as 'the Great'