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@Petsuchan Endo introduces the term as soon as Mashymre shows up in chapter 6, "Knight of Neo Zeon". Like the later Entertainment Bibles, he claims Haman adopted this name after the end of Z Gundam. The second highlighted passage reads:

Thus, CCA gives us two colonies with known dimensions and populations. Side 1's Londenion, a doppelganger for ZZ's Shangri-La, has a land area of about 250 square kilometers and a population of 5 million. That's a Parisian 20,000 people per square km. 
That comes to a total of 255 square kilometers. And as per Gundam 0083, colonies can be up to 45 km long, which would give you a maximum of 50% more land area. So can we compare this to modern cities? Preferably with diagrams...?


It turns out that Char's muted lines are in the script, though! "Take care of yourself, Artesia. I'll write you." (Spoiler: he doesn't.) Sayla asks why he's going, and he replies, "It's a man's duty to avenge his father, right?"