Aristocrates

Aristocrates was an Ephebian Philosopher and secretary to the Tyrant, specifically mentioned in Small Gods by others who follow him, Ibid, Didactylos and Xeno being the most notable. He wrote the Platitudes.

His name is a clever combination of two the three great fathers of Roundworld philosophy, Aristotle and Socrates (the only one missing is Plato), and it also works as a play on 'Aristocratic'. There did exist an 'Aristocrates of Athens', although this may not be where Terry got the name from.