Context: The Polish nobility differed in many respects from the nobility of other countries. The most important difference was that, while in most European countries the nobility lost power as the ruler strove for absolute monarchy, in Poland the reverse process occurred: the nobility actually gained power at the expense of the king, and the political system evolved into an oligarchy.

Question: What was different between the polish nobility and others?
Answer: European countries the nobility lost power as the ruler strove for absolute monarchy

Question: What happened to nobility at expense of the king?
Answer: actually gained power

Question: What did the political system eventually evolve into?
Answer: oligarchy

Question: What did the ruler strive for?
Answer: absolute monarchy