Com'on, don't laugh. I like easy when I want it, well...easy.
It's because there is a province called "Galatia" (the town is Ancyra) that is Gallic in culture. The history of Galatia is long and interesting; let's just say some Gauls went to conquer Thrace, got thrown out of it by Macedonian efforts, crossed into Asia Minor to put some sweat on the Seleucids, and settled down in Galatia in the middle of Asia Minor, becoming highly-valued mercenaries and respected foes for the kings of the East. They'd last until the Romans assimilated them much, much later.
Congratulations on having a living Seleucid Empire. A rare feat, even in easy, and even though I don't think you did anything to help them.
[In my last game, I was using the "give_trait"/"give_ancillary" console to turn Seleucid generals into 10-star, 10-acumen, 10-influence gods early in the game (I was playing Carthage) and they did survive the onslaught of basically everybody around them intact

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