Dionysius of Cyrene

Dionysius of Cyrene (Διονύσιος ὁ Κυρηναῖος), lived c. 150 BC, was a Stoic philosopher and mathematician.

He was a pupil of Diogenes of Babylon and Antipater of Tarsus.

He was famed as a mathematician, and he is probably the Dionysius whose arguments are attacked by Philodemus in his book On Signs (De Signis), where Dionysius is reported as arguing that the Sun must be very large because it reappears slowly from behind an obstruction.