Founder of the Mongol empire, d. 1227 (7,4)

I believe the answer is:

genghis khan

(Other definitions for genghis khan that I've seen before include "powerful old ruler" , "Empire-builder" , "Founder of the Mongol Empire, d. 1227" , "invader - with 16a" , "Mongol conqueror, said to be right-wing" .)

I've seen this clue in The Guardian.

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