“ LIBER PONTIFICALIS, or Gesta Pontificum Romanorum (i.e. book of the popes) , consists of the lives of the bishops of Rome from the time of St Peter to the death of Nicholas I. in 867. A supplement continues the series of lives almost to the close of the 9th century, and several other continuations were written later. During the 16th century there was some discussion about the authorship of the Liber, and for some time it was thought to be the work of an Italian monk, Anastasius Bibliothecarius (d. 886) . ”