The Dogmatic school of medicine (Dogmatics, or Dogmatici, Greek: Δογματικοί) was a school of medicine in ancient Greece and Rome. They were the oldest of the medical sects of antiquity. They derived their name from dogma, a philosophical tenet or opinion, because they professed to follow the opinions of Hippocrates, hence they were sometimes called Hippocratici. Thessalus, the son, and Polybus, the son-in-law of Hippocrates, were the founders of this sect, c. 400 BC, which enjoyed great reputation, and held undisputed sway over the whole medical profession, until the establishment of the Empiric school. After the rise of Empiric school, for some centuries, every physician counted himself under either one or the other of the two parties. The most distinguished among this school were Diocles of Carystus, Praxagoras of Cos, and Plistonicus. The doctrines of this school are described by Aulus Cornelius Celsus in the introduction to his De Medicina.