Marcus Boas, 1982.
Scifi and Sword and Sorcery actor Richard Lynch.
Horseclans is a post-atomic book series that makes sense when you read it, but it comes off as utterly insane when you describe it to other people.
The bad guys are the Greek Orthodox church, who seized power after the atomic war in America. Everyone in the states is (basically) a Dothraki. And some people have Sabertooth tigers they are telepathically bonded to.
Beautiful 1978 pinball machine, “Lost World.”