Aristotle was a scholar.
Biography
He was the tutor of Alexander the Great when he was a boy. Alexander was so impressed with him that, as an adult, he did not wipe out the Greeks, though he did enslave them. (AUDIO: Mask of Tragedy)
Aristotle received a namesake in the form of the spaceship Aristotle, which served as a command ship of the Combined Galactic Resistance. (TV: Into the Dalek)
The Doctor once attended a birthday lunch with Socrates, Plato and Aristotle. Aristotle still owed her for the party hats by the time of her thirteenth incarnation. (PROSE: The Maze of Doom)
Alternate timeline
In an alternate timeline, Barbara Wright encountered him on the steps of a library in Egypt in 322 BC. He was holding an anachronistic book that she tried to take from him. The book was, in fact The Worshipful and Ancient Law of Gallifrey. (PROSE: The Book of Shadows)