The most famous king in European history almost certainly never existed. This deep dive writes the biography of a ghost, tracing how Arthur evolved over 1,500 years from a ninth-century war leader credited with killing 960 men in a single charge, to a Welsh monster hunter chasing a divine boar, to Geoffrey of Monmouth's imperial conqueror who marched on Rome, to the passive do-nothing king of the French romances.

We examine the 400-year silence in the sources and why Gildas and Bede never mention him, the bear-god and Lucius Artorius Castus theories, the 1191 Glastonbury grave that conveniently ended the myth of his return, and how Malory, Tennyson, Marion Zimmer Bradley, and post-war novelists each rewrote Arthur to fit their own cultural anxieties.

• Dux Bellorum, not king: what the Historia Brittonum actually says about the Batt ...