The prequel was meant to be set thousands of years prior to the events depicted in Game of Thrones.
The Game of Thrones prequel project starring Naomi Watts has reportedly been cancelled by HBO.
HBO had begun teasing the prequel, making cast announcements and revealing plot elements.
A description of the prequel previously released by HBO reads: “Taking place thousands of years before the events of Game of Thrones, the series chronicles the world’s descent from the golden Age of Heroes into its darkest hour.