The Prince of Kaloria by Romana Drew

Eshley, the Prince of Kaloria, future king Ashlaria, is kidnapped, tortured, and nearly blinded by intragalactic drug dealers. He escapes, finding himself stranded on a pre-industrial world where he looks more like the drug dealing overlords than the locals. Volyta, a lovely farm girl, befriends him. Somehow, even with his limited vision, he must steal a spaceship from the drug lords and fly home to stop the war between his kingdom and Lashon.

As much as he loves Volyta, only marriage to Princess Cendry, the daughter of the Lashon king, will stop the war. But even that isn’t enough. Factions inside Lashon are demanding racial equality. And the patriarch is threatening a holy war.

Volyta may not be Eshely’s wife, but she still has his love and her own plans for this world.