Proto-Greek Language

The Proto-Greek language is the assumed last common ancestor of all known varieties of Greek, including Mycenaean, the classical Greek dialects (Attic-Ionic, Aeolic, Doric and Arcado-Cypriot), and ultimately Koine, Byzantine and modern Greek. Some scholars would include the fragmentary ancient Macedonian language, either as descended from an earlier "Proto-Hellenic" language, or by definition including it among the descendants of Proto-Greek as a Hellenic language and/or a Greek dialect. Proto-Greek would have been spoken in the late 3rd millennium BC, most probably in the Balkans. The unity of Proto-Greek would have ended as Hellenic migrants, speaking the predecessor of the Mycenaean language, entered the Greek peninsula either around the 21st century BC, or in the 17th century BC at the latest.

The evolution of Proto-Greek should be considered with the background of an early Palaeo-Balkan sprachbund that makes it difficult to delineate exact boundaries between individual languages. The characteristically Greek representation of word-initial laryngeals by prothetic vowels is shared by the Armenian language, which also shares other phonological and morphological peculiarities of Greek. The close relatedness of Armenian and Greek sheds light on the paraphyletic nature of the Centum-Satem isogloss.

Close similarities between Ancient Greek and Vedic Sanskrit suggest that both Proto-Greek and Proto-Indo-Iranian were still quite similar to either late Proto-Indo-European, which would place the latter somewhere in the late 4th millennium BC, or a post-PIE Graeco-Aryan proto-language. Graeco-Aryan has little support among linguists, since both geographical and temporal distribution of Greek and Indo-Iranian fit well with the Kurgan hypothesis of Proto-Indo-European.