Alexander was King of the ancient Greek city state Macedon and widely considered to be one of history's greatest and most successful military commanders. By the age of 30 he had created one ... Read allAlexander was King of the ancient Greek city state Macedon and widely considered to be one of history's greatest and most successful military commanders. By the age of 30 he had created one of the largest empires in history.Alexander was King of the ancient Greek city state Macedon and widely considered to be one of history's greatest and most successful military commanders. By the age of 30 he had created one of the largest empires in history.