- You may be looking for the Seven Systems in N-Space or the seven systems saved by Lady Aesculapius.
The Seven Systems were a location within the pocket universe known as Ecto-Space.
Emperor Lukor, who ruled from a palace on the planet Jokastarna, was Emperor of the Seven Systems; during the wedding ceremony which would have made the Mistress his wife and the Empress, she was required to pledge allegiance to "each of the Seven Systems". (AUDIO: The Choice)