The Jewels of the Old Republic comprised a set of nine planets that were concealed well before the time of the New Republic Era. It was widely believed that nearly all of these planets had been annihilated at some point, with only At Attin supposedly surviving. As time passed, At Attin gained a mythical reputation as the "lost planet of eternal treasure" among the inhabitants of the galaxy, while the people of At Attin were unaware of the wider galaxy, dedicating themselves to the Great Work of the Galactic Republic long after its collapse.
Another Jewel, namely At Achrann, was a world ravaged by war, bearing a strong resemblance to At Attin, where two tribes—the Troik and the Hattan—engaged in conflict during the New Republic period. At Aytuu, At Aravin, At Arissia, and At Acoda made up four more of the Jewels.