The book mentions that Qui-Gon’s Master (not yet named as Dooku at the time of writing) regarded him as one of the Order’s best duelists in 400 years. Expanded Media & Pre-Phantom Menace Era
The "Menace Revealed" era of Legends bridged the gap between episodes. Star Wars: Episode I - The Phantom Menace Legen...
The official novelization by Terry Brooks provides crucial internal monologues and lore: The book mentions that Qui-Gon’s Master (not yet