How many languages did ancient Greeks speak?

Answer 1

Greeks have always had their own language which was Greek. Greek is one of the world's oldest recorded living languages.

The history of the Greek Language begins around the late 3rd millennium BC.

In the classical period, about 500 BC, there were three versions of the Greek language. People who spoke one variety had difficulty understanding another type. Still, the languages were close enough that some people could understand the other speakers. Around 330 BC, Alexander the great created Koine Greek by taking features from the different versions of Greek that he liked and made all Greeks use that as their language. After that, Greeks spoke Koine Greek in Greece and wherever Greeks settled from Spain to India. Until about 100 AD, a person could walk from Scotland to India using only Koine Greek.

Answer 2

They spoke Greek, and some learnt other languages for trade, employment or military purposes.