The life and military conquests of Alexander III of Macedon (July 20/21, 356 - June 10/11, 323 B.C.), commonly known as Alexander the Great.The life and military conquests of Alexander III of Macedon (July 20/21, 356 - June 10/11, 323 B.C.), commonly known as Alexander the Great.The life and military conquests of Alexander III of Macedon (July 20/21, 356 - June 10/11, 323 B.C.), commonly known as Alexander the Great.