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Related Clues:
- Title first used by Simeon I of Bulgaria
- Energy boss
- Certain Obama appointee
- Political appointee
- Government honcho
- Kaiser's kin
- Antidrug kingpin
- Ruler toppled by the Bolsheviks
- Title not used after 1917
- Ruler of old
- Federal bigwig
- Titan
- One standing out in a field?
- Industrial magnate
- House of Fabergé patron