Game can be so silly sometimes...

I am Emperor of huge empire. For some reason some Emir from far away lands decides to steal my throne (which is not even the one in my throne room). Ok, challenge accepted. I travel all the way from Crimea with my humble 8000 4 star army and capture him in war for Artifact claim.

And guess what? Nothing. I literally have the guy who stole it and war is still only at 7%. Its just funny. And i did not capture him in some field after battle, i sacked his capital, where presumably that chair is. Why is CK3 like this :D Do i really have to burn down whole Arabian Empire just so the guy i have in my prison, in city i have already sacked tell me, ok, now you can have the throne back...?