Diogenes of Sinope · Epicurus Were Diogenes of Sinope and Epicurus alive at the same time? Yes. Diogenes of Sinope and Epicurus were alive at the same time, from 342 BC to c. 323 BC. Diogenes of Sinope4th-century BC Greek Cynic philosopherBorn c. 400 BC · died c. 323 BCEpicurusAncient Greek philosopherBorn 342 BC · died 270 BC HippocratesAristophanesDiogenes of SinopeAristotleChanakyaAlexander the GreatEpicurusAshokaArchimedes Diogenes of Sinope and Epicurus in bold, with some of their best-known contemporaries. Drag across to see the age each reached in any year. Faded ends mark uncertain dates.