The last of the five "Game of Thrones" prequel series writers has been revealed: He's a longtime GoT scribe, and -- at one point -- a controversial one.

According to Entertainment Weekly, GoT co-executive producer Bryan Cogman has joined the list of spinoff writers.

Here are the previous four writers revealed:

  • Max Borenstein ("Godzilla," "Kong: Skull Island")

  • Jane Goldman ("Kick-Ass," "Kingsman" and "X-Men" franchises)

  • Brian Helgeland ("Mystic River," "A Knights Tale")

  • Carly Wray ("Mad Men," "The Leftovers")

Cogman is the only writer that was part of the "Game of Thrones" family from Season 1, when he started as an assistant to showrunners David Benioff and D.B. Weiss. Cogman has written 10 episodes of GoT, including the well-regarded "Stormborn" (Season 7), "The Laws of Gods and Men" and "Oathkeeper" (Season 4), and "Kissed by Fire" (Season 3). However, he also wrote Season 5's "Unbowed, Unbent, Unbroken," the Sansa/Ramsay/Theon wedding night episode that polarized fans. It is the lowest-rated episode of the series to date on Rotten Tomatoes and IMDb.

HBO's Post Emmy Awards Reception - ArrivalsAuthor George R.R. Martin is working with all of the prequel series writers, and he has already said it's unlikely that all of them will find their way to the screen. He revealed there would be five writers back in May, although he didn't name Cogman at the time. Martin did gush, though, "He's a really terrific addition, however, a great guy and a fine writer, and aside from me and maybe Elio and Linda, I don't know anyone who knows and loves Westeros as well as he does."

GRRM also revealed, at the time, that the "sucessor shows" (his preferred term, over spinoffs) would NOT follow Robert's Rebellion or Dunk & Egg. It remains to be seen what any of the five prequels in the works will cover, or which ones will progress the fastest and actually arrive on screen.

All of that will happen after the final season of "Game of Thrones," which is now in pre-production, with Season 8 set to start filming in October to premiere ... sometime. HBO hasn't revealed the premiere date yet, but it's hoped to be in 2018 and not 2019.

Want more stuff like this? Like us on Facebook.