On the calendar of the Catholic Church, today is the feast of Pope Silvester I, who reigned from 314 to 335. 21 years, 11 months, and 1 day: 8005 days in all. His papacy is #8 on the list of the longest in history.
Little is known about Silvester I. He built a few notable churches in the city of Rome, like St. Lawrence Without the Walls. Ventilation must have been high on his list of architectural values.
He was also pope during the Council of Nicaea, famous for refuting the heresy of Arius, that Jesus was God, but created by the Father. It was a theological distinction that compelled thousands to suffer unnatural deaths.
Silvester was also the pope when Constantine was the Roman Emperor. Constantine the Great was originally a pagan who persecuted Christians. He saw a sign from heaven and converted. From that day forward, Christians were free to practice their religion without reprisals, like being thrown into the lion's den. And free to persecute and exterminate pagans and heretics, and everyone else who disagreed with them.
Legend has it that Constantine was afflicted with leprosy and, as a cure, his physician prescribed a warm bath in children's blood. Sanguinarius, may have been his name. In the nick of time, St. Peter and St. Paul appeared to Constantine in a vision and persuaded him that baptismal water might be more to his liking. And who else to baptize him, but our pope of the day, Silvester I. In gratitude, Constantine is said to have given Silvester, Sicily, Sardenia, and all other islands in the world that started with the letter 's'.
Silvester also is said to have slain a dragon. But there is not a shred of evidence that he first sought the help of a hobbit.
If you're ever in Rome you can visit the church of San Martino ai Monti and see the official hat(mitre) he wore as pope---the oldest one still to survive. Though I don't think he was wearing it when he done in that dragon.