Hidden Human History

You may be looking for the comic story.

Hidden Human History, sometimes abbreviated as H3, was a podcast that ran on Earth sometime in the early 21st century that talked about historical events. Subjects talked about on the show included, but were not limited to, famous serial killers and "wars you don't learn about in school".

The show was enjoyed by the Thirteenth Doctor's companions. Graham O'Brien recalled how Grace had it playing around the house all the time. Ryan Sinclair began listening at the insistence of his grandmother, while Yasmin Khan was turned onto it by a friend at work. Yaz praised the show as being "really well done", and that it felt more like "historical gossip" than "sitting in a lesson".

When the Thirteenth Doctor brought Team TARDIS to Guelder in the early 16th century, Yaz, Ryan, and Graham all identified it as being around the time the Guelders wars took place, as they'd learned from the podcast, much to the Doctor's amazement, and jealousy. (COMIC: Hidden Human History)