Cancelled Game of Thrones prequel with completed $30 million pilot: When was series set?

A CANCELLED Game of Thrones prequel series starring Naomi Watts was shut down after filming a single episode and House of the Dragon was green-lit the same day as a replacement. But where in George RR Martin’s A Song of Ice and Fire lore did Bloodmoon aka The Long Night take place in Westeros’ timeline?
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