There’s a Rhys and Feyre cameo in the book and feyre is described as “a heavily pregnant female” (yay Feysand babies!!! :DDD) but in ACOWAR when Feysand was discussing their future and the vision Feyre had of their son Feyre said that she did want to have kids just not yet. If I can remember correctly she said she wanted to wait a long time before they had kids so that they could have a taste of what it was like to have eternity with each other, like a few hundred years. So that means that TOG takes HUNDREDS of years after ACOWAR (unless she traveled through different time than that’s a whole other area to explore). What I get from that is Prythian is ancient (haha that word) and some of the gods and other creatures in TOG that are ancient could come from or passed by the ACOTAR world before being trapped there. Maybe Rhysand knows of those other worlds, maybe some of those gods and creature originated from Prythian. In ACOTAR Rhys is already 500+ years old in the cameo I’m guessing he’s at least 700-800 years old. And a lot of the old (not ancient) “people” in TOG including Rowan are about 500 years old and lots of events happed that long ago too. I don’t know where I’m going with this but just to pick at it a lil (I’ll be back with more hehehe)