Alexander's character matured rapidly, and he began very early to act the part of a man. When he was only sixteen years of age, his father, Philip, made him regent of Macedon while he was absent on a great military campaign among the other states of Greece. Without doubt Alexander had, in this regency, the counsel and aid of high officers of state of great experience and ability. He acted, however, himself, in this high position, with great energy and with complete success; and, at the same time, with all that modesty of deportment, and that delicate consideration for the officers under him--who, though inferior in rank, were yet his superiors in age and experience--which his position rendered proper, but which few persons so young as he would have manifested in circumstances so well calculated to awaken the feelings of vanity and elation.