I'll go for the technology above, plus the combine harvester- Adam H-D did that under the Romans, but he attributed it properly to the Gauls, I think. (I've seen it in a Pelican history of technology). I don't think the mythology has it quite right, but they went to Delphi, Turkey and Galicia, as well as upsetting some Roman geese. A number of the early church fathers were Gauls.

Penny

And if any re-enactors in Kent (Celtic name) want some early type domesticated apples, I know where there is one in the public domain.