Housed in the labyrinthine expanse of the Emperor's Imperial Palace, within the Palace of Banners, the Officio Militaris College of Arms is an ancient institution whose Adepts-Pursuivant monitor, catalogue and approve bewildering array of heraldic devices used by the various military arms of the Imperium's military forces. As the ultimate authority on all matters pertaining to sigils and marks of rank, and official arbitrators of the ownership of such marks, these adepts wield much power within the ranks of the Imperial Court, and the Lord Adept-of-Arms maintains an advisory position within the Senatorum Imperialis itself. Among the many duties of the adepts of the College is that of cataloguing and recording the near-endless array of heraldry used by the recognised Imperial Knight Houses.