James "Grizzly" Adams was a man who lived a long time ago in the 1800s. He was called "Grizzly" because he was really good at catching bears, and he even had a pet bear named Ben.
Grizzly Adams lived in the wilderness, which means he didn't live in a city or town, but in the forest and mountains with all the wild animals. He loved being in nature and learned how to survive by building his own shelter, finding food, and staying safe from dangerous animals.
People all over the country heard about Grizzly Adams and his adventures in the wilderness, so he became famous. People would come to visit him and learn from him.
Later on, someone even made a TV show about his life and adventures, and it was called "The Life and Times of Grizzly Adams"!