BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
Part of the expansive young reader material by Jude Watson in the early days of the Prequel EU, Legacy of the Jedi is a hybrid story with three parts, featuring Dooku across four eras: a young Padawan, a Jedi Master to Qui-Gon Jinn, a disconnected and disheartened Jedi exile, and a Sith Lord entangled with his past and with Obi-Wan and Anakin. We see him first being exposed to the Dark Side, pursuing revenge on a former friend, and finally the merciless and powerful monster facing memories of the past he would rather leave behind. This Legends novel is one of the most unique Star Wars books you’ll find and one that stands out as a great look at Dooku across the timeline.
Four generations of Jedi come together in this must-have Star Wars special edition, an all new story featuring Yoda, Obi-Wan, Qui-Gon, and the evil Count Dooku...before he turns bad.