Historical clue formulations

• Pope John X's successor — 2016-01-31
• Byzantine emperor known as "The Philosopher" — 2014-11-16
• Pope after John X — 2009-02-22
• Pope after John X — 2008-01-02
• Byzantine emperor called "the Wise" — 2006-09-29
• Successor to Pope John X — 2006-09-28
• Pope after John X — 2006-02-26
• John X's successor — 2003-08-22