“It wasn't at the level of naming herself as the god of this
world, but it could be said to be much like how she would handle
things... —Regardless, now the supervisor in both name and
reality, Quinella first proclaimed a single edict. For the four great
nobles of that age to ascend to the position of emperors, splitting
the Human World into four empires: north, east, south, and west.
Kirito, you have seen the walls that divided Central Centoria into
four, haven't you?”

It was my turn to nod this time as the one being asked.

The Sword Mastery Academy I lived at was in the 5th District
of Norlangarth North Empire's capital, Northern Centoria. The
white stone barrier could always be seen from the dormitory's
windows, far taller than any other structure within the city.
Beyond those walls called the «immortal walls» were the capitals
of the other empires; a great cause for surprise when I first found
out.

“The masses did not quarry marble and pile them up over
years for those walls. Quinella... no, Administrator made them
appear in an instant with her godlike might.”

(Alicization Rising, 11)