By the sixth century AD, the Greeks would use ovens heated by wood fires and communities baked in a big ol' communal oven.
I'm thinking of making a key lime pie today. I love baking! That's awesome! A baker is one who bakes, and sometimes sells, baked goods. I'm just a humble home baker. I make things just for my family and friends to enjoy. Grains have been popular for a thousand or more years, so baking is a very old practice. I never stopped to think about it! I guess they would have baked over open fire.
By the fifth and sixth centuries BCE, the ancient Greeks used enclosed ovens heated by wood fires; communities usually baked bread in a large communal oven.