Darth Nemo

The theorized the existence of a  in hiding in  in the period leading up to the. Labelled internally as "Darth Nemo," the entity was believed by the Order's intelligence section to have been responsible for coordinating the activities of splinter factions like the, and developing strategic plans to sustain the ideas of the New Order.

From its inception, the figure of Darth Nemo was attacked by members of the Jedi High Council, who did not consider the string of events indicative of the presence of a Sith or malignant Force user. At various times, about five to fifteen percent of the Order advocated the existence of Nemo, which accounted for tensions inside the Jedi organizations, especially with regards to foreign policy and public relations. Eventually, a few months before the signing of the that terminated the hostilities between the  and the, a journalist published classified documents pertaining to the Darth Nemo hypothesis, which resulted in frenzy amongst the population, necessitating official statements from high-ranking Jedi and politicians to quell the emotions.

As the Republic and the Remnant entered a period of peaceful coexistence, support of the Nemo theory gradually diminished, especially during the Yuuzhan Vong War. When former Imperial admiral became the leader of the  in 40 ABY, the concept was relived and the majority of Jedi embraced the idea. The Jedi High Council acknowledged the existence of Nemo in a closed session in 44 ABY, and agreed to take steps to prevent the spread of what it labeled Imperial culture in the Galactic Alliance. Daala, whose faction had lost their majority in the Galactic Senate following the 44 ABY elections, was unable to prevent the passing of a legislation that prevented former Galactic Empire military personnel and public officials to fulfill positions of public servitude in the Republic, and was forced to resign.

In the mostly undisturbed decades after 45 ABY, Darth Nemo was assumed to have died by the Jedi. In 137 ABY, certain Jedi fugitives tied the emergence of the One Sith to Nemo's earlier activity.

History
Following the final death of former  during the destruction of  in, the  proceeded to obliterate Imperial presence in the  and launched exploratory attacks on  territory in the  and the. In the years that followed, invasions against both the Remnant and the, a regional Imperial faction, resulted in high losses and little gain. The 's intelligence service analyzed the patterns of cooperation observed between Imperial units of the two factions during the conflict, and summarized its findings in an internal report, stating that the level of coordination implies the presence of an as-of-then unidentified entity overseeing the Empire's descendants. As the service was unable to rule out the possibility of Palpatine having taken another apprentice during his hiding on Byss in 4–10 ABY, the hypothetical Sith was given the code name "Darth Nemo"&mdash;Nemo being derived from the word for "nobody"&mdash;and further investigations were launched to determine its identity and location.