What about Darth Igrol? He is Sith, and he has served longer than anyone except Darth Xedrix
~ Sith Lord Scourge on Lord Igrol

Darth Igrol was a Sith pureblood who became a Dark Lord of the Sith and served on the Dark Council of the reconstituted Sith Empire. He ascended to the twelve-member ruling body sometime between 3,984 and 3,974 BBY, and by the year 3,954 BBY, he had served on the Council longer than any other member besides Darth Xedrix. Igrol resided on the planet Dromund Fels instead of the Empire's capital of Dromund Kaas, though he was summoned to the Imperial Citadel with eight other Dark Councilors in 3,950 BBY for a meeting with the Sith Emperor. The Emperor promptly killed the Dark Councilors mere hours before his Imperial Guard purged the remaining three, including Darth Nyriss, because five of the Councilors (including Lord Igrol) had participated in a conspiracy against the Emperor.

            Star wars old republic.png Villains

Sith Empire
Leaders: Ajunta Pall | Tulak Hord | Marka Ragnos | Naga Sadow | Sith Emperor Vitiate | Sith Empress Acina
Dark Council: Darth Acharon | Darth Arctis | Darth Arho | Darth Arkous | Darth Aruk | Darth Asamin | Darth Baras | Darth Charnus | Darth Decimus | Darth Drear | Darth Ekkage | Darth Hadra | Darth Howl | Darth Irgol | Darth Jadus | Darth Karrid | Darth Lokess | Darth Marr | Darth Mekhis | Darth Mortis | Darth Nox | Darth Nyriss | Darth Ravage | Darth Rictus | Darth Thanaton | Darth Vengean | Darth Vowrawn | Darth Zhorrid
The Empire's Wrath: Scourge
Sith Lords: Aloysius Kallig | Darth Andru | Darth Angral | Darth Atroph | Darth Cendence | Darth Chratis | Darth Enraj | Darth Fastus | Darth Gravus | Darth Hexid | Darth Ikoral | Darth Jaga | Darth Kallous | Darth Lachris | Darth Malgus | Darth Minax | Darth Nurin | Darth Ouzal | Darth Sajar | Darth Serevin | Darth Silthaar | Darth Skotia | Darth Sorranos | Darth Tormen | Darth Venemal | Darth Vich | Darth Viktus | Darth Vilus | Darth Xedrix | Darth Zash | Lord Draahg | Lord Grathan | Lord Nefarid | Lord Praven | Lord Razer | Lord Sadic | Lord Tarnis | Lord Vivicar | Vindican | Xalek
Sith Apprentices and Acolytes: Vemrin | Ashara Zavros | Jaesa Willsaam
Military: Rycus Kilran | Arkos Rakton | Bex Kotos | Cipher Nine | Harron Tavus | Imperial Guard | Lieutenant Pierce | Malavai Quinn | Moff Broyscn | Ryler Dorant | Vanto Bazren | Zora

Revan and Malak's Sith Empire
Bastila Shan | Calo Nord | Darth Bandon | Darth Malak | Darth Revan | Darth Voren | Saul Karath | Darth Glovoc | Sith Trooper

Sith Triumvirate
Darth Nihilus | Darth Sion | Darth Traya

Eternal Empire
Leader: Arcann | Valkorion | Vaylin
Soldiers: Knights of Zakuul

Other Sith and Dark Jedi
Atris | Bengel Morr | Dorjander Kace | Dread Masters | Haazen | Order of Revan | Simus

Other
Andronikos Revel | Black Sun | Black Vulkars (Brejik) | Broonmark | Cassus Fettl | Chantique | Chuundar | Colonel Tobin | Czerka Corporation | Demagol | Eagle | The Exchange (Davik Kang & Ukabi) | General Vaklu | The Great Hunt Champion | Hunter | Kaliyo Djannis | Mandalore the Ultimate | Migrant Merchants' Guild | Nem'ro the Hutt | Rakghouls | Shae Vizla | Skavak | Star Cabal | Tarro Blood | Visquis | Xor | Khem Val

Community content is available under CC-BY-SA unless otherwise noted.