Okay kiddo, so the papacy is a fancy word for the office of the Pope, who is like the leader of the Catholic Church. There are lots of stories and legends about the Pope, and some of them are pretty interesting!
One story is about Saint Peter, who was supposedly the first Pope. Some people believe that he was given the keys to heaven by Jesus, and that the Pope is still considered to have those keys today. Another legend says that the Pope has a special chair called the "Chair of Saint Peter," and that it is made of solid gold!
There are also some stories about specific Popes throughout history. For example, there was a Pope named Alexander VI who was famous for being a bit of a party animal. He supposedly threw huge, wild parties in the Vatican (which is like the Pope's fancy palace) and had lots of mistresses.
But not all the stories about Popes are fun and lighthearted. Some people believe in a legend called the "Prophecy of the Popes," which says that there will be a certain number of Popes before the end of the world. Some people think that we are currently in the time of the second-to-last Pope, and that the next Pope will be the very last one before the world ends.
So there you have it, kiddo - some of the legends and stories surrounding the papacy! Whether you believe them or not, they are certainly interesting to learn about.