
What happened with the other king with the wife? As i remember after Light ’died’ there was another king... or did I read too many isekai, and who’s tomb was that?

Kiha never became king.. That was King Moon and Queen Dana.. Light was the dude in the modern world after he died, he was transported to that timeline just like Ellin.
That tomb was for Solhwa and Light (possibly for Ellin's mom as well but they're in the past, there's no body to bury.. So im assuming its for Light.)
Make way for Iruma the King!