The nobility in our ancient state felt quite free. If it felt that the monarch was restricting its rights - it organized an armed resistance. Since the time of the Polish-Lithuanian Commonwealth, this way of expressing disagreement has been called rokash, from the Hungarian 'rakás' - crowd. And everything happened according to the law: the documents were signed by the monarch himself - Henrician Articles and the Pacta conventa ("general agreements") allowed the nobility to revolt.
To help the ruler in a situation where he could lose his throne was to assert himself as a trustworthy person. This is what happened to Mikalaj Radziwill Czorny: by supporting Žyhimont Aŭhust during the uprising of the Polish nobility, he became a close friend of the ruler of the country.
To gain the power of the Grand Duke in Belarusian and Litvin chess, the kniaź or a kniažyč must occupy the throne, the central square of the field, and hold it for one move. During this move, the rival army has a chance to postpone the final of the game: you can declare rokash to a contender for the victory.
If rokash is announced, the kniaź or a kniažyč must leave the throne.
But it can stay on the field: any piece is able to protect its ruler - to cover it with itself or throw the rebel off the field.