Tritons

The tritons were once native to the Hellish Plane of Water. Over 107-123pi, the devils under Quasxthe fought the War for Hell against the tritons, eventually driving them from the plane and to the Material Plane. The merfolk under Miranda II Arielid "the Welcomer" welcomed the tritons into their realm, giving them the dark depths in the west of their territory.

Tritons practice a form of cognatic gavelkind succession -- all lands, titles, and property are divvied up evenly between all children. For this reason, individual tritons rarely amass large amounts of territory; triton territory is not a single nation, but is ruled by upwards of 50 petty kings and queens at any one time. However, these kings tend to act in remarkable accord with one another, rarely warring between themselves and usually backing each other up in wars with outside nations.

When the Subsidence came, the tritons welcomed the diaspora of displaced merfolk into their territory, just as the merfolk had welcomed the tritons 400 years earlier. Today, the two nations have merged into one, with two systems of rulership, called Merwe.