Crossword Genius

Title first used by Holy Roman Emperors (6)

Ross

I believe the answer is:

kaiser

(Other definitions for kaiser that I've seen before include "Ex-ruler of Germany" , "Old German emperor, pre-Hitler" , "Austrian bigwig" , "Emperor of Austria or Germany until 1918" , "Former German emperor" .)

I've seen this clue in The Sunday Times and The Times.
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