Historical clue formulations

• Librettist for Verdi's "Otello" and "Falstaff" — 2017-02-10
• "Otello" librettist — 2000-05-04
• "Mefistofele" composer — 1997-09-17
• "Mefistofele" composer — 1996-04-27
• "Mefistofele" composer — 1994-01-30