User blog comment:FairyRaven/Fairy Tail Chapter 360:The White Inheritance, Review and Commentary/@comment-9468724-20131117114459/@comment-24066070-20131117132537

I don't think Lumen Histoire is the White Legacy. First of all, LH belongs to FT and this Faith/White Legacy clearly belongs to the MC. Considering Ultear was a member of the MC it is likely she learned about it and passed the information to Hades and he in turn passed it to Tartarus.

Furthermore, if LH is a potential danger to Zeref or the Balam Alliance, why didn't Hades just destroy or relocate it? If destroying or relocating it was impossible he could've changed the seal in order to prevent anyone (Makarov) from accessing it. I think LH contains some message/lesson/memories from Mavis.

About Ivan finding out about it, the most plausible explanation would be that he heard so from Obra and wanted to obtain it for himself. It seems that Obra is actually that small ?imp? which reported back to Zeref. I think Zeref knows about LH but not the details and that he at some point send Obra to Raven Tail in order to test FT (FT and RT would surely fight eachother) while at the same time watch the GMG.

I know Mavis said that Ivan likely got information regarding LH from Hades, but that doesn't make sense. If Hades told anything about it, he would also tell Ivan how to obtain it or what it was all about. He wouldn't say shit like "FT has a dark secret called Lumen Histoire. Good luck finding it."