Trials by combat are out, and trials of seven are in.

A Knight of the Seven Kingdoms‘ fourth episode, aptly titled “Seven,” introduces the latter concept, a twist on Game of Thrones‘ classic trial by combat. And if Ser Duncan “Dunk” the Tall (Peter Claffey) wants to make it out of Ashford Meadow alive, he’s going to have to get very familiar with the trial of seven very quickly.

What is a trial of seven?

While a trial by combat sees two champions facing off to determine the guilt of an accused party, a trial of seven ups the ante sevenfold, with 14 champions battling it out. This more archaic form of trial is rooted in Andal tradition. They believed that having seven champions on each side — a number corresponding to the number of gods in the Faith of the Seven — would result in more divine justice.

In “Seven,” Aerion Targaryen (Finn Bennett) demands a trial of seven to judge Dunk’s guilt. Dunk stands accused of attacking a Targaryen prince, which he did do, but only because Aerion was harming innocent puppeteers. Will the gods (rightfully) deem Dunk’s actions as honorable, as he was defending the defenseless?

Aerion’s brother Daeron (Henry Ashton) has also accused Dunk of kidnapping their younger brother Aegon, also known as Egg (Dexter Sol Ansell). While this is patently false, as Egg himself will tell anyone who bothers to listen, the trial will go on. With the Targaryen family against him, the odds are decidedly not in Dunk’s favor.

Remembering who all 14 champions are in A Knight of the Seven Kingdoms is no small feat. As we head into the actual trial of seven, here are the champions you need to know, on both Dunk’s side and Aerion’s.

Who is on Aerion’s side in the trial of seven?

Finn Bennett in “A Knight of the Seven Kingdoms.”
Credit: Steffan Hill / HBO

At one end of the jousting lists, we have Team Aerion (Boo! Hiss!), also known as Team Targaryen. This squad is packing some serious royal power, including Aerion himself and his father, Maekar (Sam Spruell). Also taking the field is Daeron Targaryen, but given that he tells Dunk he plans to hang back, and even asks him to give him a knock on his helmet, I don’t see him as being much of a threat.

Also fighting for Aerion are three members of the Kingsguard: Ser Donnel of Duskendale (Bill Ward), Ser Roland Crakehall (Wade Briggs), and Ser Willem Wylde, who is not credited in the show but appears in George R.R. Martin’s novella The Hedge Knight.

Rounding out the team is the extra dishonorable Ser Steffon Fossoway (Edward Ashley), who claims he’ll fight with Dunk only to switch up at the last second in order to get a lordship from Aerion. This un-knightly move leaves Dunk in the lurch, because if he doesn’t get seven champions, he’ll automatically be found guilty and receive a dire punishment: losing his hand. Luckily for him, he winds up with six other champions after all. Here’s who.

Who is on Dunk’s side in the trial of seven?

Dexter Sol Ansell in “A Knight of the Seven Kingdoms.”
Credit: Steffan Hill / HBO

With the help of Egg, Dunk recruits a motley crew of knights. His new bestie, Ser Lyonel Baratheon (Daniel Ings) is raring at the opportunity to participate in the first trial of seven in a century, claiming he doesn’t want “to miss a chance to bloody up the Kingsguard.”

Ser Humfrey Hardyng (Ross Anderson), who broke his legs and lost his horse in a joust against Aerion, has also joined up hoping to settle his score with the tyrant prince. His brother by marriage, Ser Humfrey Beesbury (Danny Collins), has also pledged his help to Dunk. Sure, Aerion has three Targaryens, but Dunk has two Humfreys, so who’s really winning here?

One-eyed knight Ser Robyn Rhysling (William Houston) is also on Dunk’s side, saying that while he’ll always be a faithful servant to the crown, “when the crown goes against the gods, Ser Robyn goes against the crown.”

The final two members of Dunk’s side are surprises, in different ways. Upon hearing of his cousin’s treachery, Raymun Fossoway (Shaun Thomas) steps up to be knighted on the spot by Lyonel. He’s not the only last-minute addition to Dunk’s team, though. The final honor goes to none other than Prince Baelor Targaryen (Bertie Carvel) himself, who values Dunk’s honor.

With that, the battle lines are drawn and the stage is set for a divine trial, one with the potential for serious Targaryen-on-Targaryen violence. Which side will come out on top in this once-in-a-century smackdown?

A Knight of the Seven Kingdoms is now streaming on HBO Max, with new episodes hitting HBO and HBO Max Sundays at 10 p.m. ET.