Board Thread:Questions and Answers/@comment-24003222-20150906084121/@comment-1038387-20150906105903

Fatality is, but most of their history together isn't. That involves Cosmic Odyssey (as background) and John Stewart's time in the Darkstars. For Green Lanterns, the only pre-New 52 info that's possibly canon is the Green Lantern: Rebirth-era (2005 onward). So that would include Yrra's conversion, but not their backstory.