The Empiric school of medicine (Empirics, Empiricists, or Empirici, Greek: Ἐμπειρικοί) was a school of medicine founded in Alexandria the middle of the third century BC.[1] The school was a major influence on ancient Greek and Roman medicine. The school's name is derived from the word empeiria (ἐμπειρία "experience") because they professed to derive their knowledge from experiences only, and in doing so set themselves in opposition to the Dogmatic school. Serapion of Alexandria, and Philinus of Cos, are regarded as the founders of this school in the 3rd century BC. Other physicians who belonged to this sect were: Apollonius of Citium, Glaucias, Heraclides, Bacchius, Zeuxis, Menodotus, Theodas, Herodotus of Tarsus, Aeschrion, Sextus Empiricus, and Marcellus Empiricus. The sect survived a long time, as Marcellus lived in the 4th century AD. The doctrines of this school are described by Aulus Cornelius Celsus in the introduction to his De Medicina.