Diocletian. The frumentarii were replaced by the agentes in rebus. They were run by the princeps peregrinorum who was considered to be a senior centurion and answered to the praetorian prefect. The subprinceps was the second-in-command to the princeps peregrinorum and the optio peregrinorum, canaliclarius, and aedilis castrorum were all other offices in the frumenatarii. The curatio frumentarii would command the frumentarii in the imperial provinces. The frumentarii served in the officium consularis of the local governor. The following story has been used as evidence of the role of the frumentarii: References Bibliography AE 1910,0077 & AE 2003,0931 Military units and formations of the Roman Empire Infantry units and formations of ancient Rome Defunct intelligence agencies Army reconnaissance units and formations