(Κτησίβιος).

1. A Greek historian, who probably lived at the time of the first Ptolemies, or at least after the time of Demosthenes, for we learn from Plutarch (Plut. Dem. 5), that Hennippus of Smyrna referred to him as his authority for some statement respecting Demosthenes. According to Apollodorus (apud Phlegon. de Longaev. 2), Ctesibius died during a walk at the age of 104, and according to Lucian (Macrob. 22), at the age of 124 years. Whether he was the author of a work, Περὶ Φιλοσοφίας, referred to by Plutarch (Vit. X Orat. p. 844c.) is uncertain.