Galatia was the most long-lasting and powerful Celtic settlement outside of Europe. It was the only kingdom of note to be forged during the Celtic invasions of the Mediterranean in the 4th and 3rd centuries BCE. From its foundation, Galatia was a formidable power in Asia Minor, capable of demanding tribute from powerful states like the Kingdom of Pergamon.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/1421/conflict--celts-the-creation-of-ancient-galatia/.