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  ===Successor series===
  In May 2017, after years of speculation about possible successor series, HBO commissioned Max Borenstein, Jane Goldman, Brian Helgeland, Carly Wray, and Bryan Cogman to develop individual ''Game of Thrones'' successor series; all of the writers were to be working individually with George R. R. Martin, who also co-wrote two of the scripts. D. B. Weiss and David Benioff said that they would not be involved with any of the projects. 
  Martin said that all the concepts under discussion were prequels, although he believes the term "successor show" applies better to these projects, as they are not ''Game of Thrones'' spin-offs in the traditional sense. He ruled out Robert's Rebellion (the overthrow of Daenerys' father by Robert Baratheon) as a possible idea and revealed that some may be set outside Westeros. Later, he stated: "at least two of them are solidly based on material in ''Fire and Blood''." In September 2018, regarding the other four projects, HBO president of programming Casey Bloys said that some of them have been abandoned completely, while others remain as possibilities for the future. In May 2019, Martin stated that two other projects were still in the script stage, but are "edging closer". In April 2019, Cogman confirmed his prequel would not be moving forward.