The name Pelasgians (, Pelasgoí; singular: Πελασγός, Pelasgós) was used by some ancient Greek writers to refer to populations that either were the ancestors of the Greeks or preceded the Greeks in Greece, "a hold-all term for any ancient, primitive and presumably indigenous people in the Greek world". In general, "Pelasgian" has come to mean more broadly all the indigenous inhabitants of the Aegean Sea region and their cultures before the advent of the Greek language. This is not an exclusive meaning, but other senses require identification when meant. During the classical period, enclaves under that name survived in several locations of mainland Greece, Crete, and other regions of the Aegean. Populations identified as "Pelasgian" spoke a language or languages that at the time Greeks identified as "barbaric", even though some ancient writers described the Pelasgians as Greeks. A tradition also survived that large parts of Greece had once been Pelasgian before being Hellenized. These parts generally fell within the ethnic domain that by the 5th century BC was attributed to those speakers of ancient Greek who were identified as Ionians.