Which Greek Stoic philosopher mentioned two of the four subgroups of the Helvetians that failed in their migration attempt to Gaul?
Posidonius Posidonius (Greek: Ποσειδώνιος, "Poseidonios", meaning "of Poseidon") "of Apameia" (ὁ Ἀπαμεύς) or "of Rhodes" (ὁ Ῥόδιος) (c. 135 BCE – c. 51 BCE), was a Greek Stoic philosopher, politician, astronomer, geographer, historian and teacher native to Apamea, Syria.
Critias (dialogue) Critias ( ; Greek: Κριτίας ), one of Plato's late dialogues, recounts the story of the mighty island kingdom Atlantis and its attempt to conquer Athens, which failed due to the ordered society of the Athenians. "Critias" is the second of a projected trilogy of dialogues, preceded by "Timaeus" and followed by "Hermocrates". The latter was possibly never written and "Critias" was left incomplete. Because of their resemblance (e.g. in terms of persons appearing), modern classicists occasionally combine both "Timaeus" and "Critias" as "Timaeus-Critias".