History of the Greek alphabet
The history of the Greek alphabet began with the adoption of Phoenician letter forms in the 9th–8th centuries BC during early Archaic Greece and continues to the present day. The Greek alphabet was developed during the Iron Age, centuries after the loss of Linear B, the syllabic script that was used for writing Mycenaean Greek until the Late Bronze Age collapse and Greek Dark Age.
Source: Wikipedia — History of the Greek alphabet (CC BY-SA 4.0)