ELI5: Explain Like I'm 5

St Patrick's Rock

St. Patrick's Rock is a big rock in Ireland that people think is very important. It's also called the Rock of Cashel. Long time ago, a big king saw this rock and thought it was a great spot for his castle. He built his castle there and everyone thought it was really cool. Then, a guy named St. Patrick came along and he turned the king into a Christian. The king became very religious after that and he decided to give his castle to St. Patrick. St. Patrick then used the castle as a place to teach people about his religion. Nowadays, people visit St. Patrick's Rock to learn more about Irish history and see the old castle ruins.