Possible Clues:

• Writer who popularized the saying 'To err is human, to forgive divine'
• Vatican personality
• ''Fools rush in'' source
• Head of Catholic church
• Fabian, for one
• Alexander, poet or religious leader? Depends on order
• Poet's page to begin poetically
• Alexander --, English poet (1688-1744)
• One of five Nicholases
• The leading Catholic essayist