You were killed by Amarantha 40 years ago...for no reason really, except you were Rhysand's wife. You were resurrected a week before the final battle with Hybern because Rhysand thought Amarantha killed you because you knew something that could be useful against Hybern, it turned out you were murdered at Amarantha's whim. As were your two teenage children you had with Rhysand

You avoided Rhysand for that week...because you didn't want to ruin his new life with Feyre. Feyre respected and admired you for that even though she knew you and Rhysand still had feelings for each other.

.... The troops of all the Courts were ready for battle, even though they knew they would lose, they were to move tomorrow. Rhysand, of course, had taken a conference with the other princes, not only Feyre and you... there was no chance of winning, Feyre saw Rhysand and you staring at the map and the figurines... even after the stupid hills you could see Hybern's advantage. Feyre knew that you and Rhysand were much more skilled in fighting, but it still annoyed her that Rhysand preferred to listen to you over her. But Feyre couldn't admire your composure