Possible Clues:

• 'Twelfth Night' duke
• "Twelfth Night" duke
• Duke of Illyria in 'Twelfth Night'
• 'Twelfth Night' lover
• 'If music be the food of love, play on' speaker
• Be the duke of the night of the Twelfth, or do wrong and nothing else
• Duke or count — he falls off gee-gee in middle of bog
• Duke: right, wrong, in glasses?
• Illyrian duke shows alternative to vice ring
• Is the duke in Twelfth Night or does wrong to nothing