High fantasy set in a post apocalyptic world. More-so when all of the technology is forgotten, or unknown, rather than when they are making use of the barely working technology.

The Shannara series is the only book/tv series I have read that fits this. I myself have set several of my RPG campaigns in a setting like this, and am working on another when the TMNT RPG is rereleased.

Into the Badlands (TV Show) is a close setting, it is feudal post apocalyptic fantasy where they have limited technology.