P.166 - §1 There are seven superuniverses in the grand universe, and they are constituted approximately as follows:
P.166 - §2 1. The System. The basic unit of the supergovernment consists of about one thousand inhabited or inhabitable worlds. Blazing suns, cold worlds, planets too near the hot suns, and other spheres not suitable for creature habitation are not included in this group. These one thousand worlds adapted to support life are called a system, but in the younger systems only a comparatively small number of these worlds may be inhabited. Each inhabited planet is presided over by a Planetary Prince, and each local system has an architectural sphere as its headquarters and is ruled by a System Sovereign.
P.602 - §4 Lucifer and his first assistant, Satan, had reigned on Jerusem for more than five hundred thousand years when in their hearts they began to array themselves against the Universal Father and his then vicegerent Son, Michael.
P.511 - §3 The present head of Satania is a gracious and brilliant ruler, and he is a rebellion-tested sovereign. When serving as an assistant System Sovereign, Lanaforge was faithful to Michael in an earlier upheaval in the universe of Nebadon. This mighty and brilliant Lord of Satania is a tried and tested administrator. At the time of the second system rebellion in Nebadon, when the System Sovereign stumbled and fell into darkness, Lanaforge, the first assistant to the erring chief, seized the reins of government and so conducted the affairs of the system that comparatively few personalities were lost either on the headquarters worlds or on the inhabited planets of that unfortunate system. Lanaforge bears the distinction of being the only primary Lanonandek Son in all Nebadon who thus functioned loyally in the service of Michael and in the very presence of the default of his brother of superior authority and antecedent rank. Lanaforge will probably not be removed from Jerusem until all the results of the former folly have been overcome and the products of rebellion removed from Satania.