Alexander the Great was an ancient Macedonian ruler and one of history's greatest military leaders. As King of Macedonia and Persia, he established the world's largest empire. ancient times have seen. By turns charismatic and ruthless, intelligent and power-hungry, diplomatic and bloodthirsty, Alexander inspired such loyalty in his men that they would follow him anywhere and if need, will die in the process. Although Alexander the Great died before realizing his dream of uniting a new kingdom.