was he a king?
Yes, of Macedon.
Alexander the Great
Alexander III of Macedon (, ; 20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great (, ), was a king ("basileus") of the ancient Greek kingdom of Macedon and a member of the Argead dynasty. 
the most common language in the eastern mediterranean during the height of the roman empire was Koine Greek. how did it get the name? The English-language name "Koine" derives from the Koine Greek term , "the common dialect". where was it used first? By the armies of Alexander the Great
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Alexander the Great [SEP] Introduction
Alexander III of Macedon (, ; 20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great (, ), 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.