Feast of Saint Clement I — November 23

The feast of Pope Clement I, an early bishop of Rome from the first Christian generations, falls on 23 November. The basilica in Rome that carries his name is built in layers like a cut cake: a twelfth-century church sits over a fourth-century basilica, which sits over a first-century Roman house holding a Mithraic temple. Few buildings anywhere let a visitor walk down through eighteen centuries on a single staircase.