An anatomist of the 2nd century AD, mentioned in Galen’s commentary on Hipp. De nat. hom. at 15.136.8-11. Elsewhere, Galen names him as “the person who, in the period after the ancients, revived anatomical theory” ( De plac. Hipp. et Plat. 126.96.36.199) and cites his work on the cranial nerves. Galen knew some twenty anatomical works by this author ( De libris propriis 19.25.9).