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  ===Writing===
  The episode was written by series co-creators David Benioff and D. B. Weiss.
  "And Now His Watch Is Ended" was written by showrunners David Benioff and D. B. Weiss. It was based on George Martin's novels, chapters Tyrion X from ''A Clash of Kings'' and Jaime IV, Tyrion II, Samwell II, the first part of Arya VI, and the second half of Daenerys III from ''A Storm of Swords''.
  Benioff and Weiss considered this episode one of the "big ones" and a turning point of the series. Weiss said that when he was reading the books he was swept away by Daenerys' final scene, and remembered thinking how he'd be able to put it on screen if he could ever get to film it.
  This final scene includes the first instance of the High Valyrian language in the series, apart from short stock phrases, spoken by Daenerys. Up to this point only the Astapori dialect of Low Valyrian, a creolized form of the ancient language of the old Valyrian Empire, had been heard, spoken by the slaver Kraznys. David J. Peterson, the language creator hired by the series, designed both versions of the tongue.