Just read a (potentially) crack theory about Old Nan possibly being Shiera Seastar. I'm not too sure about this, mainly because Shiera, with all the glamour and whatnot, doesn't really seem like the type of person to abandon her life and become a wetnurse in the North. Maybe once Bloodraven was taken away, she went with him and stopped at Winterfell? Plus there's the whole Young-Nan + Dunk thing that I kind of like. Do we even know how Shiera died? Can't wait to hear your thoughts on this.