The Game of Thrones prequel will air "sometime in 2022".
Work is currently underway on House of the Dragon, which is set around 300 years before the events depicted in the HBO series - which came to an end after eight seasons last year - and tells the story of House Targaryen but fans still have some time to wait before it appears on screen.
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HBO executive Casey Bloys told Deadline: "My guess is sometime in 2022. They are starting writing.
"Obviously it's a big, complicated show."