Historical clue formulations

• Macbeth and Macduff — 2018-06-28
• Macbeth and Macduff — 2015-06-14
• Old English aristocrats — 2010-05-21
• Macbeth and Macduff — 2005-08-12
• Macbeth and others — 1997-08-11
• Scottish chieftains — 1994-11-20