Looking for Fantasy books where its so far into the future technology has collapsed and the world is "starting over"

Hey all, Im looking for Fantasy/midieval books that take place in a time that's flung into the future that the collapse of technology has long since happened and been forgotten and civilization is starting over.

Im fine with it being dark, prefer actually but would like to avoid apocalypse themes.

Edit: Wow this blew up, thank you all very much!