There is variety of answers but I would say tools and fire. Also, being on the moon before anyone else.
Your answer would be the option of Island hopping moving towards Japan by taking one island at a time
The Fourth Crusade (1202–1204) was a Latin Christian armed expedition called by Pope Innocent III. The stated intent of the expedition was to recapture the Muslim-controlled city of Jerusalem, by first conquering the powerful Egyptian Ayyubid Sultanate, the strongest Muslim state of the time.
Genghis khan i think
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