Role-playing game historian Jon Peterson, author of Playing at the World, reviews twelve rare artifacts that grant us unique insight to the initial development of Dungeons & Dragons. They include original documents from Braunstein, an early letter from Gary Gygax on the medieval setting, Dave Arneson’s notes for his own early medieval game, fanzines and maps associated with the Castle & Crusade Society, and various pre-publication D&D rules. In his first videoblog ‘A history of D&D in 12 treasures’, Jon shows these items and shares his knowledge. For more D&D history, visit Jon’s blog Playing at the world.