“Knight,” created by Ira Parker with George R. R. Martin, is set a century before the events of “Thrones.” As the series opens, Dunk, a squire, stands on a desolate one-tree hillside, lowering the body of his mentor, the late Ser Arlan of Pennytree (Danny Webb), into a grave. “I don’t know the right words,” Dunk says. “You were a true knight. You never beat me when I didn’t deserve it.” (Well, except that one time.) Later, lying under a sunny sky, he brainstorms aloud, talking to his three horses. Should he go to King’s Landing? Lannisport? Join the City Watch? He imagines this, brandishing Ser Arlan’s longsword: “Stop raping, ser!” Hmm, the sword fits his grip. And hmm!—the good idea cometh. “There is a tourney at Ashford Meadow . . .” he says, thoughts visibly moving across his face and firming into resolve.journey-inline-newsletterinline-newsletter