Looking at the map, I was suddenly struck with the similarity to a reconstruction of Ghengis Khan's capital Karakorum. The reconstruction of the layout based on archaeological facts is a lot more recent than the first maps of the Rubble. The descriptions in old travelogues (like William of Rubruk or contemporary Persian sources) is of course older.
This doesn't make Joraz Khyrem a Gloranthan Ghengis (that's reserved for Sheng), but in this regard there is an astonishing degree of parallel.