Around the time of the Gallic invasion of Europe under Brennus in 278, a group of Gauls under Leonnorius or Lutarius headed east to Thrace. This wouldn't have been a problem for the Seleucids, had Nicomedes of Bithynia- the head of the anti-Seleucid coalition- not invited the Gauls into Anatolia. This week, Antiochus has to deal with the consequences...

Sources for this episode:

NOTE: The Encyclopaedia Britannica states that the Gauls crossed over into Anatolia independent of their enlistment by the anti-Seleucid league. However, as I haven't seen this interpretation elsewhere, I've not included this in the main narrative.