"After all, Plato only had one teacher, and Alexander"

 For four generations in Ancient Greece there existed a begatting of knowledge in which Socrates taught Plato, who taught Aristotle, who went on to teach Alexander the Great.

Education was important in Ancient Greek civilisation, and could be formal (occurring in a school, or with a private tutor) or informal (occurring in an ad-hoc public forum, with an unpaid teacher or philosopher, such as Socrates.) Greek education focused on training the whole person, mind, body and spirit. Generally speaking, education was an exclusively male preoccupation, though there were exceptions, such as in the Spartan system or among followers of Pythagoras.