Common ancestor of all varieties of Greek
Egowo
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 and, ultimately, Koine, Byzantine and Modern Greek.
Proto-Greek speakers entered Greece sometime during the European Bronze Age with the diversification into a southern and a northern group beginning by approximately 1700 BC.
Text adapted from Wikipedia, CC BY-SA 4.0.