4. A contemporary of Galen, about the middle of the second century after Christ, who belonged to the sect of the Empirici, and held a disputation for two days with Pelops (probably at Smyrna), in defence of their doctrines (Galen. De Libris Propr. 100.2, vol. xix. p. 16). It does not seem possible to decide with certainty whether this is the same person who is frequently mentioned in different parts of Galen's writings; who wrote on marasmus (De Differ. Febr. 1.10, vol. vii. p. 315, De Marc. cc. 5, 6, 7, 9, vol. vii. pp. 685, 689, 694, 701, De Caus. Pul. 4.10, vol. ix. p. 176, De Meth. Med. 7.6, 10.10, vol. x. pp. 495, 706), on materia medica (De Compos. Medicam. sec. Loc. 7.1, vol. xiii. p. 14, De Compos. Medicam. sec. Gen. 2.5, 3.9, vol. xiii. pp. 502, 642), and on catalepsy (Cael. Aurel. De Morb. Acut. 2.10, p. 96 ; conf. Gal. Comment. in Hippocr. "Prorrhet. I." 2.90, vol. xvi. p. 684). Several of his medical formulae are preserved, from one of which it appears that he practised at Caesareia (Galen, de Compos. Medicam. sec. Loc. 4.8, 7.4, 5, 9.5, vol. xii. p. 735, vol. xiii. pp. 88, 105, 304; Paul. Aegin. 7.12, p. 663; Aet. 3.1. 48, p. 503; Nicol. Myr. De Compos. Medicare. 41.14, 21, p. 785). He is also mentioned by Galen, De Febr. Differ. 2.6, vol. vii. p. 347, De Plenit. 100.4, vol. vii. p. 530. It is uncertain whether the Philippus of Macedonia, one of whose antidotes is quoted by Galen (De Antid. 2.8, vol. xiv. p. 149), is the same person.

A sophist of this name is said by Aetius (1.4. 96, p. 186) to have promised immortality to those persons who would engage to follow his directions, but it is not specified that he was a physician ; neither is it known whether the father of the celebrated physician, Archigenes, whose name was Philippus (Suid. s. v. Ἀρχιγένης), was himself a member of the medical profession.