According to the list of Popes furnished us by St. Irenaeus, Anacletus is probably the same person as Cletus, the successor of Linus and the predecessor of Clement on the papal throne. Some say that he was banished from Rome and returned to rule the Holy See a second time. He completed the tomb of St. Peter at the Vatican, near which he was himself interred. To him is assigned the decree that bishops should be consecrated by three bishops at least; that clerics should be publicly ordained by their own bishop and that they all should receive Holy Communion after the consecration in the mass of ordination. He was martyred under the Emperor Trajan.
(Source: The New Roman Missal, Rev. F. X. Lasance)