 Complete the following phrase:  The Pavlyuk uprising of 1637 was a Cossack uprising in Left-bank Ukraine and Zaporizhia headed by Pavlo Mikhnovych against the abuses of the nobility and magnates of PolishLithuanian Commonwealth. The uprising was sparked by several Cossacks expelled from the Cossack Registry. Mikhnovych ordered the captured commanders of the Registered Cossacks to be executed and issued a declaration, in which he proclaimed a fight against the masters. Defeated by the forces of Mikołaj Potocki in the 