Another "Game of Thrones" prequel is coming

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Winter is coming...

And so is another "Game of Thrones" prequel... maybe.

HBO is not saying anything on the subject.

Reports say author George R.R. Martin is working on a project set roughly 300 years before the main series which would be all about what led to the fall of House Targaryen.

House Targaryen was one of the major ruling families featured in Martin's books and the hugely popular series.

The HBO series ended its run in May.

Martin says he is basing it on his book "Fire and Blood."

HBO has already made another related pilot that takes place thousands of years before "Game of Thrones" though they have not ordered a full series yet.