Freedon Nadd is a fictional Dark Lord of the Sith and King of Onderon created by Tom Veitch for the Tales of the Jedi series of comics published by Dark Horse Comics.
Nadd was a Jedi who fell to the dark side and slew his Jedi master Matta Tremayne. He then ventured in search of Sith knowledge and discovered exiled Dark Lord Naga Sadow on Yavin 4. After learning all he could from Sadow, Nadd, in Sith tradition, slew Sadow and assumed the mantle of Dark Lord of the Sith.
Sometime later, Nadd conquered the planet of Onderon and established a dynasty that ruled the planet for centuries. His last Sith scion would be King Ommin. After Ommin's daughter Galia eloped with and married dissenter leader Oron Kira, aligned herself with the Jedi, and assumed the throne, Ommin attempted to return from retirement and reclaim the throne with the help of Nadd's spirit.
With it became apparent that Ommin couldn't reclaim the throne, Nadd abandoned him in favor of Empress Teta nobles Satal and Aleema Keto and later former Jedi Ulic Qel-Droma and Exar Kun. After Nadd turned Kun to the dark side, Kun turned against Nadd and destroyed Nadd's spirit. In the midst of this second death, Nadd proclaimed the Keto's and Ulic Qel-Droma the true heirs to the Sith and Kun a mere pretender.
- Freedon Nadd's entry at Wookieepedia