boris and gleb cathedral or borisoglebsky cathedral. famous architectural monument of the pre-mongol period. chernihiv city

ancient architecture boris borisoglebski borisoglebskiy borisoglebsky borisoglebskyi borys borysohlibskiy borysohlibsky building buildings built bysanthine cathedral chapel chernigov chernihiv church cross culture detinets ditinets dome dytynets eastern europe exterior famous gleb glib historical interesting international landmark local medieval monastery monument museum national old orthodox outdoors park people place premongolian religion religious sky structure style tomb ukraine ukrainian