Adeptus Terra
The Adeptus Terra, also known as the Priesthood of Earth, is the government of the Imperium of Man. When we say government, however, we use this in the loosest sense of the term. In theory, the Adeptus Terra is the umbrella organization that all branches of the Imperial government belong to, serving under the God-Emperor of Mankind. In practice, the Adeptus Terra is extremely disunited, with member branches extremely distrustful of each other.
Organisation
Several organizations belong to the Adeptus Terra, though only in the loosest sense of the word:
- Adeptus Administratum
- Adeptus Munitorum
- Departmento Exacta
- Officio Assassinorum
- Estate Imperium
- Imperial Fleet
- Navis Imperialis
- Merchant Fleets
- Civil Fleets
- Navis Nobilite
- Officio Logisticarum
- Officio Medicae
- Officio Agricultae
- Logis Strategos
- Astra Cartographica
- Rogue Traders
- Templars Psykologis
- Officio Sabatorum
- Planetary Governors
- Ambassador Imperialis
- Adeptus Astra Telepathica
- Adeptus Astronomica
- Adeptus Arbites
- Adeptus Astartes
- Adeptus Custodes
- Adeptus Fidicius
- Synopticon
- Logos Historica Verita
Special cases
Though functionally independent, the Space Marines Chapter are officially part of the Adeptus Terra, as their loyalty is to the Emperor, who is the official head of the Adeptus Terra.
In the same way, whilst the highest and mightiest consider the Adeptus Custodes a nominal part of Adeptus Terra, the Dread Guardians of the Ten Thousand do not consider themselves apart of the Imperium at all, as part of the Imperial Household (the royal retainers and servants of the monarch) they exist outside of the Imperial apparatus of power.
The Logos Historica Verita is an interesting one. As the newest branch created by Roboute Guilliman, it is not clear where it should be placed in the organisation chart. But the most likely theory is that it is oversaw by the Primarch himself.
Where is the rest?
Though allied to the Adeptus Terra, the Adeptus Mechanicus is a separate organization which only has nominal ties to the Adeptus Terra. And despite wielding enormous power within the Imperium, the Ecclesiarchy and the Inquisition are officially not part of the Adeptus Terra.
