Game Of Thrones Prequel: Trailer (HBO) | Targaryen History And Lore | Fire And Blood Back in early 2019, HBO announced a Game of Thrones prequel phase with 5 prequels under development. Blood Moon (The long night) was first prequel to be officially announced in August 2019. NOW joining the prequel production under George R.R. Martins guidance, a brand new venture for HBO in the world of GOT… Targaryen History !! -COMING LATE 2020Watch GOT HD QUALITY on HBO NOW in 1 month for FREE! Watch GOT HD QUALITY on HBO NOW in 1 month for FREE!