high tower in izborsk fortress, pskov region, russia

and apart attack barbican border both brother built burial cannons centuries chronicle compatible constructed designed east entrances estonian fortress gate governance inner izborsk just krivich larger lithuanian long maximum meters most mound nikolski now occasional oprichnina others portcullis prone pskov range regiment region reinforcement republic rest rurik russia russian shown side slavonic still than that the there thickened thicker tourist tower towers truvor two walls which while wide width