Azor Ahai is a fascinating character from the mythology of A Song of Ice and Fire. His story is central to the faith of R’hllor, also called the Lord of Light, a religion practiced mainly in Essos.
And yet, R'hllor chose her for a reason ... Game of Thrones did not resurrect Catelyn Stark like the A Song of Ice and Fire books did, but The Winds of Winter can more than make up for it.