Henry VIII was a king of England a long time ago, who lived hundreds of years ago. He was a very important figure in history because he changed the way people in England thought about religion and power.
When he became king, the people in England were mostly Catholic. That means they believed in a certain way of practicing Christianity, and recognized the Pope in Rome as the leader of the church. But Henry VIII didn't agree with everything the Pope wanted him to do, so he decided to make his own church. It was called the Church of England and it was different than the Catholic Church.
Henry VIII also had a lot of wives. He ended up getting married six times! This was a big deal because at that time, it was very rare for a king to get a divorce. Henry wanted to have a son to inherit the throne after him, but his first wife, Catherine of Aragon, couldn't give him a son. So he asked the Pope for permission to divorce her, but the Pope said no because it went against their religious beliefs. So Henry VIII decided to break away from the Catholic Church and make his own church that would allow him to get a divorce and marry someone else.
But even after Henry created his own church, he still had problems getting a son. He ended up having a daughter, Elizabeth, who became a very famous queen. Henry VIII was also known for being very powerful and sometimes ruthless. He executed many people, including two of his own wives, because he thought they were plotting against him.
So, to sum it up: Henry VIII was a king of England who made his own church, got married six times, and was very powerful. He changed a lot of things in England and is remembered as a very important historical figure.