Ποσειδώνιος), the name of two Greek physicians, who have been confounded together by Sprengel (Hist. de la Méd. vol. ii. p. 92, French transl.), and placed in "the time of Valens ;" and also by M. Littre (Oeuvres d'Hippocr. vol. iii. p. 5), who, while correcting one half of Sprengel's chronological mistake, falls himself into the same error, and equally supposes them to have been one and the same individual, whom he places in the first century after Christ.