Inscriptions and monuments related to the Mithraic Mysteries are catalogued in a two volume work by Maarten J. Vermaseren, the "Corpus Inscriptionum et Monumentorum Religionis Mithriacae" (or CIMRM). The earliest monument showing Mithras slaying the bull is thought to be CIMRM 593, found in Rome. There is no date, but the inscription tells us that it was dedicated by a certain Alcimus, steward of T. Claudius Livianus. Vermaseren and Gordon believe that this Livianus is a certain Livianus who was commander of the Praetorian guard in 101 CE, which would give an earliest date of 98–99 CE.