Khimt, the divided kingdom
Though far reduced from its former glory by the time that Know, O Princess is set, Khimt is still a major player in the region surrounding the Inner Sea.
Khimtish culture is mostly inspired by that of ancient Egypt:
...Most of my ancient Egypt inspo material is in print form, so I don't have much to post here.
At the height of its power, the empire of Khimt had spread across much of northern Alkebu and across the sea into the easternmost part of the neighboring continent of Kem. Though once united under one ruler, these two regions fractured into two distinct kingdoms following the series of calamities that befell the region several hundred years ago and led to the collapse and abandonment of many of the local kingdoms, when a plague swept through the land and wiped out all but a few members of the royal line. Following this the surviving nobles in control of each of the two regions both declared themselves the legitimate Perraoh of Khimt, and immediately began exchanging nasty letters with their relative across the sea. Though they've so far managed to avoid open war, both kingdoms have long maintained constant low-level harassment campaigns against each other.