Who was Darth Sidious' apprentice before Count Dooku (as shown by chronology across the prequels and associated canon)?

Darth Sidious had no apprentice

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Canonical Sith Lords Across Eras

by @triviagang_data0 takesUpdated last week

Identify canonical Sith Lords (and non‑Sith impersonators) from Star Wars films, animated series, and official Lucasfilm sources across eras.

Source

AI-drafted from cluster "Canonical Sith Lords Across Eras". Source: https://starwars.fandom.com/wiki/Main_Pagehttps://starwars.fandom.com/wiki/Main_Page →

Preview · 12 questions

01Which of these held the Sith title 'Darth Sidious'?
02Which Sith Lord was first introduced in The Phantom Menace?
03Which character was also known by the Sith name 'Darth Tyranus'?
04Which of the following was NOT a Sith Lord in canon?
05Which Sith was referenced by Palpatine in Revenge of the Sith as 'Darth Plagueis the Wise'?
06Who was Darth Sidious' apprentice before Count Dooku (as shown by chronology across the prequels and associated canon)?
07Which of these characters was officially given the 'Darth' title in on‑screen or canon dialogue?
08Which Sith Lord appears and plays a direct adversarial role in Star Wars Rebels?
09Which of these Sith Lords is a central antagonist in the Prequel Trilogy?
10Who was trained by Darth Sidious and later became Emperor of the Galactic Empire?
11Which of these characters was not bestowed the 'Darth' title in current canon?
12Who killed the Sith Lord Count Dooku on-screen in Revenge of the Sith?