I want to know the answer to the following question:
Who revoked the King of Poland's sovereignty over Prussia in 1660?
All the background I'm provided with is that "Taking advantage of the Swedish invasion of Poland in 1655, and instead of fulfilling his vassal's duties towards the Polish Kingdom, by joining forces with the Swedes and subsequent treaties of Wehlau, Labiau, and Oliva, Elector and Duke Frederick William succeeded in revoking king of Poland's sovereignty over the Duchy of Prussia in 1660.". Is that enough to answer the question?
Answer: yes