John of Cappadocia

One was John of Cappadocia from Asia Minor, and the other was Peter Barsymes, a Syrian. John was praetorian prefect from 531 to 541, Peter from 543.

…master plan by the prefect John of Cappadocia, altered administrative, judicial, and military structures in Thrace and Asia Minor. In general, John sought to provide a simplified and economical administrative structure in which overlapping jurisdictions were abolished, civil and military functions were sometimes combined in violation of Constantinian principles, and…