But in A Knight of the Seven Kingdoms Episode 4, we learn of a new kind of trial by combat that we’ve never seen before. Spoilers for A Knight of the Seven Kingdoms Episode 4 ahead! Aerion Targaryen invokes an ancient trial by combat method in A Knight of the Seven Kingdoms Episode 4. In fact, this trial took place about 160 years before A Knight of the Seven Kingdoms and centered around King Maegor I, Rhaenyra’s great-great-great-granduncle. A Knight of the Seven Kingdoms Episode 4 is now streaming on HBO Max.