Board Thread:Fun and Games Forum/@comment-25932172-20170421232928/@comment-26355186-20170516173351

(The first mention regarding Cayde in Vanguard databases was 126 years prior to the events of the game. No actual determination of when he became the Hunter Mentor though.)

"Go right ahead, Warlock​. Lead us into the jungle aimlessly, in the hope that your Ghost will be able to both finish the analysis and devise a way for us to return to our time before the Vex catch us, which they will." Fenrir continued, maintaining his grip on Solis' shoulder. "Or​, we could hole up in the Icarus facility, a structure proven to remain with little battle damage in our time, which also happens to be equipped with Golden Age technology that would almost certainly ease the process of analysing the Gatelord's radiolaria."