Nico Diath was a Human male Jedi Master who lived during the final decades of the Galactic Republic. Diath was descended from the ancient Jedi Master Sidrona Diath, and took his nephew Tae as his Padawan, helping him to control his telepathy. As a Jedi, Diath roamed the Outer Rim and emancipated more than one thousand slaves. He rarely visited the Jedi Temple on Coruscant, but was regarded as a legend of the Jedi Order. Four months after the initiation of the Clone Wars, Diath was assigned as the leader of a team, comprised of fellow Jedi Masters Jon Antilles, Knol Ven'nari, Fay, and Jedi Knight Obi-Wan Kenobi, on a mission to the planet Queyta.