WI - Galatians conquer Greece instead of Asia Minor

In the 200s BC Gallic war bands invaded Greece and made it as far south as Delphi. In the end, however, they were repulsed and ended up settling in central Anatolia. What if they managed to conquer Greece? Would it have been easier for a Diadochi dynasty like the Seleucids to conquer the area later on? What effects would this have on Roman expansion?
 
I would be surprise they conquer all of Greece. The Greeks simply better and more soldiers, better tech, greater logistics and greater wealth then Brennos and his Army.

What you may see is a Gallic version of the Yuan dynasty in Greece. It be easy picking for the Seleucides. (And Pyrrhus would just be out of luck.)
 
Perhaps the same areas of inland Greece that South Slavic tribes took over during the Byzantine Era, could be taken over by Celtic tribes in the Hellenistic Era? This would mean substantial areas under control of Gauls, but with distinct remaining Greek areas.

Without Asia Minor to really support the Greeks though, Asia Minor mired in Seleucid meddling, the remaining polities in Greece might fall or integrate the Gauls into a kingdom that like early Macedon is "half-barbarian".

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