In this question, I couldn't help but notice that the third starmap listed contains a territory called the "Martian Empire".
I could not find any reference to this Empire in Memory Alpha or Memory Beta via an (albeit) brief search, and I also noted that the other starmaps in that post do not have this space marked off, instead they have that area mostly empty, with a much smaller territory called the "Typhon Expanse" almost dead centre (Although this could be a result of the lossy 3d -> 2d conversion).
So, finally my questions:
What is the canonicity of this "Martian Empire"?
In what shows/books/etc. was it mentioned?
And when was (-will?) it supposed to have existed)?