The Hutt Grakkus was obsessed with the Jedi and collected artifacts of the Force-users.
Darth Maul has two blood brothers; Savage Opress and Feral.
Darth Maul is the son of Nightsister Mother Talzin. Palpatine betrayed Talzin and stole Maul from her after promising to make her his apprentice.
Qui-Gon Jinn was once the Padawan of Count Dooku before Dooku left the Jedi Order.
Asajj Ventress ruled the planet Rattatak for ten years before becoming apprenticed to Count Dooku.
Asajj Ventress’s Jedi master was named Ky Narec.
Count Dooku was Yoda’s last personal Padawan before the fall of the Galactic Republic.