Game of Thrones” writer and co-executive producer Bryan Cogman has joined the list of scribes tasked with developing the “successor shows” of the HBO hit drama/fantasy series, according to a report by Entertainment Weekly. George R.R. Martin himself confirmed the EW news on his official page, writing that “all the deals are signed” and he can now reveal that Bryan Cogman is on board “to pen the fifth of the successor shows.”

Fans will be thrilled

Martin went on to give more details about Cogman’s participation, revealing that the series he will be working on is an adaptation and is set during a “very exciting” era of Westeros.

The author said fans of the books will be thrilled by what Cogman is set to develop for the “Game of Thrones” franchise. Martin further said that he and Cogman will be co-creating the successor show and that the two will be working together “every step of the way.”

Cogman joins four other writers

Bryan Cogman, who has been part of “Game of Thrones” since before the first season aired, will join four others focused on these follow-up shows.The current pool of writers, Jane Goldman, Brian Helgeland, Max Borenstein, and Carly Wray, are also collaborating closely with G R.R. Martin. The author wrote on his official page that he is excited about some of the ideas they have come up with so far.

Martin revealed that apart from what the writers are developing, he also has ideas of his own, which he described as four weird-ass series concepts.

The author expressed confidence that when the time comes, HBO will have a wealth of materials to choose from.

'Prince of Dragonstone'

Current GoT showrunners, David Benioff and D.B. Weiss decided not to be involved with the planned prequel after Game of Thrones” season 8 airs its final episode either in 2018 or 2019. That is why Bryan Cogman - who started as an assistant to the showrunners and rose to become a producer of the show - is the next logical choice to do the project.

G.R.R. Martin said that if Benioff and Weiss are the “Kings of Westeros” then Bryan Cogman is the “Prince of Dragonstone.” He also called Cogman “The Keeper of the Lore” and praised his extensive knowledge of GoT and its canons.

Possible GoT prequel release date

Martin - who is still writing “The Winds of Winter" - reiterated that not all five successor shows will eventually make it on TV. He thinks that two or three could reach the pilot stage with the possibility of one emerging sometime in 2019 or 2020.