[edit] Sith Apprentices before Bane's Order
Ulic Qel-Droma (apprentice to Exar Kun; left the Sith Order)
Darth Malak (apprentice to Darth Revan; usurped the rank of Sith Master from him)
Darth Bandon (apprentice to Darth Malak; killed by Revan)
Yuthura Ban (apprentice to Uthar Wynn; redeemed by Revan)
Bastila Shan (apprentice to Darth Malak; redeemed by Revan)
Visas Marr (apprentice to Darth Nihilus; redeemed by the Jedi Exile)
Darth Nihilus (apprentice to Darth Traya; died shortly after reaching the rank of Sith Master)
Darth Sion (apprentice to Darth Traya; died shortly after reaching the rank of Sith Master)
[edit] Sith apprentices in Darth Bane's Order
Darth Zannah (rose to rank of Sith Master)
Darth Cognus (rose to rank of Sith Master)
Darth Millennial (departed before he became Master)
Darth Vectivus (rose to rank of Sith Master)
Darth Plagueis (rose to rank of Sith Master)
Darth Sidious (rose to rank of Sith Master, having killed his master Darth Plagueis in his sleep)
Darth Maul (died before reaching rank of Sith Master)
Darth Tyr!@#$ (died before reaching rank of Sith Master, betrayed by his master before he could set his own plans into motion)
Vergere (fled after attempting to kill her Sith Master)
Darth Vader (became Sith Master after killing Darth Sidious, abandoned the dark side of the Force and returned to the light as a Jedi Knight in fulfilling Force prophecy as Anakin Skywalker)
You can see were it all began