It's an ancient civilization that worships Susan Wainwright. Often shrouded in mistery, space, and time.
Has a lot of ties with Sunset Valley, the Caucasus and Central Asian countries, Sixam, and the Dinglebogian Empire.
The beginning[]
The Susancient civilization is seen to have started about a million years ago, on Earth, more specifically somewhere around Uralsk, Kazakhstan.
At various points it had various colonies and even expanded to almost the whole of the Earth.
Blaze Wainwright seems to derive from the Susancient Civilization which is why she got adopted by Susan and Boyd.
Going to live off-Earth[]
During the war that killed Blaze's biological parents, some members of the Susancient civilization (mostly from what is now the Caucasus and Central Asia) shuttled off really far, on the opposite direction from where the other main planets in the war were.
They eventually ended up on a refuge on planet Susopolis. Planet Susopolis is mostly water except for an island that resembles Susan Wainwright's face. There are some Susopolis natives, but being from many species (including of course humans from Earth and Graslaxians from Sixam) and life states live there, and are part of the culture.
Encounter with the Dinglebogians[]
Yup, at one point, Dinglebog even annexed Susopolis, which was part of the Dinglebogian empire for many years, until the Rebellion.
Close to Present Day[]
Serelar zoi Susances made five Susan clones and dropped them off with Bobby Multiplo and Cinque Sole.
Eventual discovery[]
Erin Kennedy and Susan Wainwright discovered the Susancient civilization through the Dinglebogian Empire and the clones.