Khovanshchina is a big story about people who lived in Russia a long time ago. These people were called "nobles" and they were very important. The story talks about how some of these nobles did not like the way the king was running things.
There were two sides in this story - the nobles who supported the king, and the ones who didn't. The ones who didn't were led by a man named Prince Khovansky. He was very powerful and had a lot of people following him.
Things started to get really tense between the two sides, and there were even some fights. Eventually, the king's army came to stop Prince Khovansky's followers. The king won, and Prince Khovansky's followers were punished.
The story is very interesting because it talks about how power and loyalty can cause a lot of trouble between people. Even though this story is from a long time ago, it can still teach us important lessons about how we treat each other today.