A diocese is a region of the Imperium as divided by the Adeptus Ministorum. Each is headed by a Cardinal who might control hundreds of Preachers within the diocese. Each diocese originally encompassed hundreds of worlds.[1a] Ecclesiarch Sebastian Thor, as part of his reforms, reduced the size of a diocese and therefore limited the individual power of each Cardinal, making it harder for any one Cardinal to gain too much power.[1b] In the modern Imperium, a single Diocese generally encompasses an entire world.
- 1: Codex: Sisters of Battle (2nd Edition)
- 2: Realm of Chaos: The Lost and the Damned, pg. 168, The Imperial Cult