Related: Why didn't Alexander the Great invade Rome? "In short, if the Persians defeated Alexander, the world might be unrecognizable," Nikolaus Overtoom, an associate professor of history at ...

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Alexander was born in Pella ... Syria and Egypt without suffering a single defeat. His greatest victory was at the Battle of Gaugamela, in what is now northern Iraq, in 331 BC.

In 334 B.C. Alexander's forces defeated the Persians at the battlefield ... later earning him the epithet 'the Great,' but [was] also a pivotal moment in world history," team leader Reyhan ...