I'm not sure any realm on the Western half really had "traditional borders." That case could maybe be made for Astrum and the Terran Republic, but most of the other realms were colonies and in a constant state of colonization, war and expansion.
There were often wars, sure, but the land occupied by Caerwyn for most of its time was also the land held by Kabrinskia for most of its time and then by the Farronite Republic for most of its time too. Between the crunches and the expansions, a lot of it belonged to a number of other realms, but there were still "loose" borders that seemed to come back again and again.
'moot borders were pretty straightforward. They were pretty much named at the very start, and then the realms expanded until they got them, and then it pretty much remained until their deaths, exceptions made for Aurvandil's conquests and the monster invasion.
