I watched a Civilization series streamers do a St. Paddy's day live once. But there's no Irish civ, so he picked the Gauls led in the game by Ambriorix.

They have him portrayed as a ginger with red braids, beard & mustache. I'd never really thought of the connection between the mainland Gauls & the Emerald Isle Celts before.

Then I started thinking back to the old Asterix & Obelisk cartoons coming out of France that have the ancient Gauls portrayed with red hair as well just like their modern day Irish cousins.