The Rogues wax and wane philosophically (and topically) as they attempt to reconcile Celts, Vikings, and Mongols with the Pop Culture idea of "Barbarians".

Citations used:

Mongols:

https://www.theodysseyonline.com/how-barbaric-were-the-mongols

https://phdessay.com/are-mongols-barbarians/

https://www.shoutoutuk.org/2014/11/17/the-mongols-not-the-barbarians-we-were-told/

Vikings:

https://www.mirror.co.uk/news/uk-news/truth-vikings-not-smelly-barbarians-3183358

https://www.bbc.com/news/magazine-26431858

https://www.encyclopedia.com/fashion/encyclopedias-almanacs-transcripts-and-maps/vikings-last-barbarians

Celts:

https://www.theguardian.com/science/2015/oct/04/celts-great-torque-snettisham-hoard-british-museum-alice-roberts

https://www.history.com/topics/ancient-history/celts