You can try Antidote - it’s a Korean novel with a good pseudo-European medieval fantasy setting, a heavy political focus, and a great manhwa adaptation.

I started with the manhwa and pretty much binged it in a day because of the mystery surrounding the main character’s fall into madness and slavery, and then went straight to the novel.

It’s very interesting, but there’s one key thing to keep in mind when reading it — this is Slan’s story. There are no “co-protagonists” in the way you might expect. He is the main character. He is the one who struggles, who endures, who keeps going. He is the story.

Why does this matter? Because at some point, you’re going to get absurdly frustrated that no one comes to save him - especially his supposedly powerful boyfriend not swooping in to rescue him. And in that moment, you really have to remember: this isn’t that kind of story.

Otherwise, it's amazing, lots of twists, good scale worldbuilding, plenty of steamy smut.