Proto-Greek language

The Proto-Greek language, also known as Proto-Hellenic, is the Indo-European language which was the last common ancestor of all varieties of Greek, including Mycenaean Greek, the subsequent ancient Greek dialects (i.e., Attic, Ionic, Aeolic, Doric proper, Arcadocypriot, Northwest Greek, ancient Macedonian—either a dialect or a closely related Hellenic language) and, ultimately, Koine, Byzantine and Modern Greek (along with its variants). Proto-Greek speakers entered Greece sometime during the European Bronze Age (c. 3rd millennium BC) with the diversification into a southern and a northern group beginning by approximately 1700 BC.