Historical clue formulations

• Johann ___, 16th-century defender of Catholicism — 2018-12-21
• Johann ___, opponent of Martin Luther — 2015-01-17
• Pitcher Dennis in Cooperstown, for short — 2013-05-15
• Theologian Johann — 2012-09-30
• Theologian Johann — 2011-08-04
• Opponent of Luther during the Protestant Reformation — 2011-03-25
• Luther opponent Johann — 2010-09-10
• Theologian who opposed Martin Luther — 1998-01-18