Okay kiddo, let's talk about Saint Nicholas! He's a man who lived a long time ago, and many people know him as the person who inspired Santa Claus!
Saint Nicholas was born in a place called Patara, which is in modern-day Turkey, around 270 AD. He grew up to become a bishop, which is a really important role in the church.
Now, Saint Nicholas was a really kind person, and he loved helping people. He was especially known for helping poor people and children. He would give them gifts, especially around Christmas time.
One story goes that there was a poor family with three daughters. The family was so poor that they couldn't afford to get married, which was a big problem back then. But Saint Nicholas heard about their problems and decided to help. He snuck into their house at night and left three bags of gold for the family. The money helped the daughters get married, and the family was able to live a happier life.
Saint Nicholas became known all over the world for his kindness, and people started celebrating his feast day on December 6th. This is the day when he died, and it's still celebrated in many countries today!
So, that's who Saint Nicholas was, and why we remember him. He was a really kind person who loved to help others, especially those who needed it the most. And thanks to him, we have the idea of Santa Claus - a jolly old man who brings gifts to children all around the world!