Around 304, Iamblichus founded his own school at Apameia (near Antioch), a city famous for its Neoplatonic philosophers. Here he designed a curriculum for studying Plato and Aristotle, and he wrote grand commentaries on the two that survive only in fragments. Still, for Iamblichus, Pythagoras was the supreme authority. He is known to have written the Collection of Pythagorean Doctrines, which, in ten books, comprised extracts from several ancient philosophers. Only the first four books, and fragments of the fifth, survive.