Alexander III of Macedon (Greek: Αλέξανδρος Γʹ ὁ Μακεδών, Aléxandros III ho Makedȏn; 20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great (Greek: ὁ Μέγας, ho Mégas), was a king (basileus) of the ancient Greek kingdom of Macedon and a member of the Argead dynasty. He was born in Pella in 356 BC and succeeded his father Philip II to the throne at the age of 20. He spent most of his ruling years on an unprecedented military campaign through western Asia and northeast Africa, and by the age of thirty, he had created one of the largest empires of the ancient world, stretching from Greece to northwestern India. He was undefeated in battle and is widely considered one of history's most successful military commanders.
Source: Wikipedia, "https://en.wikipedia.org/wiki/Alexander_the_Great", available under the CC-BY-SA License.