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I remember I had a book once that described a chess variant known as "Emperor Wars". (I don't know if it may have been the only copy (it was made of plain paper, probably printed by computer or typewriter, did not mention any author's name or copyright notices, had hand-written corrections in it), and I don't know where it is now.)

The game included such pieces as Plebians, Emperor, Tribune, Senator, Vestal Virgin, Praetorian Guard, Centurion, and possibly others I don't remember. Plebians are normally gray and can change color; also they can push other pieces and crush other pieces. I think Senator immobilized adjacent pieces except Plebians and Emperor. The initial setup involved Plebians already placed but other pieces must be placed one at a time before you start moving them.

Do you have any other information, or is perhaps the only copy I had?