To be fair, there was a part wherein that one of the civlizations in the Book of Sorrow noted meeting Taox, who revealed the true identity of the recently transformed Oryx and siblings (if I remember) and her relationship to them. This was if I remember in the hind end of one of the wars. I -think-it was the Ecumene, so this was about 20,100 years after, give or take, the beginning.