Alexander maybe be the best general in human history, but he is not the only to be undefeated. Russian General Alexander Suvorov was undefeated in battles against the Poles, and French in the 1780s and 1790s. Also, Jan Zizka, Scipio Africanus, and Duke of Marlborough were other commanders who never lost a battle.
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#3
Suggested by
Ionis Ioanou
He got drunk and burned Persepolis
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#4
Suggested by
Ionis Ioanou
He spread Greek culture in Asia during his conquest