Agria and Shaloor are the names of the two feuding countries in Across the Kolgan Sea. No one knows the particulars of why the two peoples hate each other since both sides tell a different story. Some Agrians claim that the Shaloor were a malcontented segment of the middle class that they had to exile for numerous crimes, whereas some Shaloor claim they merely escaped from forced thralldom. Either way, the consensus is that they were once the same people that divided over some reason.
But none of that matters anymore, as the two kingdoms have mostly forgotten this ancient war, and have simply made a tradition of opposing the other.