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<p>While Alexander the Great's successors were fighting over control of his empire, Celtic-speaking migrants were moving east along the Danube River, mostly unseen and unnoticed by the Greeks to their south. The Macedonian kings should've been paying more attention, because soon, those Celts would launch one of the largest invasions of Greece in recorded history.</p><p>Patrick's book is now available! Get The Verge: Reformation, Renaissance, and Forty Years that Shook the World in hardcopy, ebook, or audiobook (read by Patrick) here: https://bit.ly/PWverge. And check out Patrick's new podcast The Pursuit of Dadliness! It’s all about “Dad Culture,” and Patrick will interview some fascinating guests about everything from tall wooden ships to smoked meats to comfortable sneakers to history, sports, culture, and politics. https://bit.ly/PWtPoD</p><p>Listen to new episodes 1 week early, to exclusive seasons 1 and 2, and to all episodes ad free with Wondery+. Join Wondery+ for exclusives, bi...