This is the subsector as presented in Supplement 3 and in the Deluxe Traveller four color map. This works for any time after the Fourth Frontier War (1084) and before the Fifth Frontier War (1107).
The Fourth Frontier War was hard on the Darrian
Confederation. They lost the three Entropic planets to the Sword
World yet again, and this time the Zhodani were not going to allow them
to start a little war to get them back. And while the Imperium continued
to back the Darrian Confederation's claim on the planets, they were not
willing to sanction the war needed to resolve the issue.
Sensing the weakened state of the Confederation, Nonym and Condaria took the opportunity to secede. Nonym had long desired to chart their own, independent course. Condaria was just unhappy with their second-tier status within the Confederation.
The lone consolation prize allowed to the Confederation was the marginal planet Cunnonic they managed to wrest from the Sword Worlds. As a hedge against losing Cunnonic, the Confederation has encouraged Darrian Aslan to migrate to the planet with land grants.
The military base on Nosea was turned over to the Imperium and turned into an Imperial naval base. The stated reason for its existance is to help check any future Sword World aggression, but it is also likely to check any Darrian aggression as well.
The majority of the population of Roget are the decendants of mercenary Aslan who, while fully part of the Darrian Confederation, wish to maintain their cultural identity.