Shortly after Disney bought Star Wars they declared all previous material except for the I-IV movies and Clone Wars show/movie to be erased from the fictional Star Wars timeline (canon). They re-branded all the previous material as "Legends" and are only considering valid the new media made by Disney.
http://www.starwars.com/news/the-legendary-star-wars-expanded-universe-turns-a-new-page
Here's why I won't read anything from the new Disney canon of Star Wars
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