The Seraphim
(Also referred to as the Cardinals (archaic), the Gatekeepers, the Unholy Guard, and the Mercurians.)
The lowest of the Tower, these elite of the Ministry serve as defenders, aides and administrators to the Septimi.

The Seneshals
The "Vice Septimi" who govern when their respective masters are unavailable.
The Shrouds
The spies who answer directly to the Septimi.  Even the Seneshals may not command the Shrouds.
The Tongues
The counselors who advise the Septimi in matters of diplomacy and propaganda.
The Guardians
The elite bodyguards and defenders of the entire Tower, who act on the Septimi's consensus (to be overruled only at the Allfather's will) and secure the Seat of Light against all outsiders.
The Retributors
The bodyguards and personal assassins of the Septimi, each defending and answering to one Septimus alone.  Curiously, the Allfather has never allotted any for his own defense.
The Marshall
The Septimus council's direct liaison to the Judicares.  In this capacity of command, the Marshall's will supercedes that of the Archbishops.
The Majori Domo
The Right Hands and chief administrators of the Septimi.
The Serviri
The lowest of the Seraphim, these servants attend the needs of the Allfather and the Septimi, busying themselves with the menial chores.  Some answer to the entire council at the Seat of Light, others serve only the Allfather or one Septimus.