Theodorus was a disciple of
Aristippus the Younger, grandson of the elder and more famous
Aristippus. He heard the lectures of a number of philosophers beside Aristippus; such as
Anniceris, and
Dionysius the dialectician,
Zeno of Citium, and
Pyrrho. He was banished from Cyrene, but for what reason is not stated; and it is from the saying recorded of him on this occasion, "Men of Cyrene, you do ill in banishing me from Libya to Greece", as well as from his being a disciple of Aristippus, that it is inferred that he was a native of Cyrene. Of his subsequent history there is no connected account; but the anecdotes of him show that he was at Athens, where he narrowly escaped a trial, perhaps for impiety. The influence, however, of
Demetrius Phalereus reportedly shielded him; and this incident may therefore probably be placed during Demetrius' ten years of administration at Athens, 317–307 BCE. As Theodorus was banished from
Athens, and was afterwards in the service of
Ptolemy in
Egypt, it is not unlikely that he shared the overthrow and exile of Demetrius. The account of
Amphicrates of Athens cited by
Diogenes Laërtius, that he was condemned to drink
hemlock and so died, is doubtless an error. While in the service of Ptolemy, Theodorus was sent on an embassy to
Lysimachus, whom he offended by the freedom of his remarks. One answer which he made to a threat of
crucifixion which Lysimachus had used, was celebrated by many ancient writers (
Cicero,
Seneca, etc.): "Employ such threats to those courtiers of yours; for it matters not to Theodorus whether he rots on the ground or in the air." From the court or camp of Lysimachus he returned apparently to that of Ptolemy. We read also of his going to
Corinth with a number of his disciples: but this was perhaps only a transient visit during his residence at Athens. He returned at length to Cyrene, and lived there, says Diogenes Laërtius, with
Magas, the stepson of
Ptolemy, who ruled Cyrene for fifty years (c. 300–250 BCE) as viceroy and then as king. Theodorus probably ended his days at Cyrene. Various characteristic anecdotes of Theodorus are preserved (Laërtius,.
Plutarch,
Valerius Maximus,
Philo, etc.), from which he appears to have been a man of keen and ready
wit. ==Philosophy==