Great Khan
From Tardis Wiki, the free Doctor Who reference
Kublai Khan was the Great Khan, an emperor of the Mongols who ruled over all of Asia in the second half of the 13th century, (TV: Marco Polo, PROSE: Marco Polo)
Another Great Khan of a feline-like species invaded a large part of a planet where the Steel Stump of Strength and Power, part of the Wicket Gate, resided. (PROSE: Doctor Who and the Krikkitmen)