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  == Production ==
  Series veteran Bryan Cogman wrote this episode.
  "Oathkeeper" was written by Bryan Cogman based on ''A Storm of Swords''. Reviewer Walt Hickey of FiveThirtyEight notes that the episode "contained the final scene of Jaime Lannister’s ninth ''"Storm of Swords"'' chapter. But lots of material from that chapter hasn't been on the show yet, so I reasoned that he has completed only eight." In addition to chapter 72 (Jaime IX), some of the content from this episode is also found in ''A Storm of Swords'' chapters 61, 68, and 71 (Sansa V, Sansa VI, Daenerys VI).
  Theresa DeLucci, a reviewer for ''Tor.com'', notes that the episode "didn't even take liberties with the books; it completely made up whole new stories" that do not appear in ''A Storm of Swords'', including conversations between Missandei and Grey Worm, Bran's appearance at Craster's keep, and the final White Walker scene. Reviewers from IGN applauded the new material, noting that the scenes at Craster's keep "give Bran something to do" and hint at the nature of the White Walkers. Erik Kain, of ''Forbes'' magazine, notes these departures from the books as well, stating that the episode departed as much from the books as any episode thus far in the HBO adaptation of Martin's book series. These deviations, notes Kain, "leave both readers and newcomers to the story of Westeros and its motley band of heroes and villains entirely uncertain as to what's coming next."