User blog comment:FairyRaven/Fairy Tail Chapter 357: The Nine Demon Gates, Review and Commentary/@comment-112.198.64.42-20131027154249/@comment-5303512-20131027175117

No, all that Crux mentioned that the door combined celestial magic with magic from the book of Zeref, the original purpose was to use it to control time, but the magic item was out of control because of the full moon, so it was a device that even Crux had knowledge of even when they had no contact with it what so ever in the past series, so it has to be a device even from 400 years ago or so on.