This was the first game from the creators of Dungeons Of Kremlin and Smuta.
Info (on Russian) - http://www.ag.ru/games/staroe_zoloto
Demo can be downloaded from the same site - http://minifiles.ag.ru/demos/17412/Old_Gold3d.zip (or, if the direct link doesn't work - http://www.ag.ru/files/demos/staroe_zoloto )