Okay kiddo, so legends are stories that people tell that may or may not be true. In Sweden, people have been telling stories for a long, long time about kings who were super special and great.
One of the most famous legendary kings was named Odin. He was a really powerful god who was said to have lived a really long time ago. People thought he was really wise and strong.
Another king story is about Eric the Victorious. He was said to have been the first king of Sweden and ruled a long time ago. People thought he was really brave and won a lot of battles.
Then there was King Gustav Vasa. He lived a long, long time ago and was said to have saved Sweden from another country trying to take over. He is also famous for starting a new religion in Sweden called Lutheranism.
So these legends are just stories, but they are still important to people in Sweden because they show how strong and great their country can be with good leaders.