Catholic tradition is uncertain on the spelling: Cletusor Anacletus, because the earliest traditions of church leadership were oral only. In fact, Francis A. Sullivan SJ (From Apostles to Bishops) says that most scholars are of the opinion that, in spite of these traditions, the early church of Rome was led by a group of presbyters, and that bishops were not appointed to the church in Rome until later in the second century. In other words, there can have been no Pope Linus, nor either a Pope Cletus or Pope Anacletus, although it is just possible there was a presbyter with a name similar to one of these