Knjaz'ja (Князья), which translates to 'Land Lords' or 'Princes' is a quick card game recreating early medieval Russia, the Kievan Rus', which includes (according to the box blurb) 'politics, economics, strategy and luck'.
It is a card game with rather simple mechanics. The player could perform only one action during his turn:
(1) take a card from the desk
(2) play a card
(3) declare the assault on other players city
After this the next player(players act in order, going clockwise) perform his action.
There are several types of cards. Cities, buildings, armies and events. Each city and most of the buildings has Glory (Victory) Points values. When the deck is over the game is finished and the player with larger number of Glory Points is winner. Moreover, there are special event card "Mongol invasion" which could also finish the game. With armies you can capture or defend your cities from capturing.