So, a very long time ago (more than 2,000 years!), there were a group of people called Celts who lived in a place called Transylvania. Transylvania is a part of the world that is now in Romania.
The Celts were a group of tribes that spoke a language called Gaelic. They were famous for their warrior skills and their love of art and music. They also had their own religion and gods.
When the Celts came to Transylvania, they settled in the mountains because it was a good place for them to protect themselves from enemies. They built forts and villages and lived off the land by farming and hunting.
The Celts in Transylvania were also known for their metalworking skills. They were able to make beautiful jewelry and weapons out of metal. They traded with other tribes and even had contact with the Greeks and Romans.
Eventually, the Romans came and conquered the Celts in Transylvania. This meant that they took over their land and made them follow their own rules and religion. However, the Celts left an impact on Transylvania that can still be seen today in the art and culture of the region.