According to Strabo (VII.3.2) and Herodotus, the people of Bithynia in northwest Anatolia originated from two Thracian tribes, the "Bithyni" and "Thyni", which migrated from their original home around the river Strymon in Thrace. Therefore, they spoke the Thracian language. In addition, Strabo (VII.3.2) claims that the neighbouring Phrygians were also descended from a Thracian tribe, the "Briges", and spoke a language similar to Thracian. In fact, it has been established that both Bithynians and Phrygians spoke the Phrygian language. Phrygian is better documented than Thracian and Dacian, as some 200 inscriptions in the language survive. Study of these has led mainstream opinion to accept the observation of the ancient Greek philosopher Plato ("Cratylus" 410a) that Phrygian showed strong affinities to Greek. Georgiev argued in one article that Phrygian originally belonged to the same IE branch as Greek and Ancient Macedonian (which did not include Thracian or Dacian), but later adopted the view that Phrygian constituted a separate branch of Indo-European, (also unrelated to Thracian or Dacian). This position is currently favoured by mainstream scholarship.