Board Thread:General Grimm Discussion/@comment-3125844-20150908191150/@comment-1509826-20150913170301

Wolfwand wrote: Trubel or chavez. Last key is related to them.

I know, I figured it would be Trubel. Grimm's made the keys, and clearly the descendants of the original seven knights took them.

Nicks branch is implied to one of the oldest, considering how vast their collection of diaries was (including the very oldest one in existence was).

Josh's went back at least to the middle ages.

And I looked it up, the Name Rubel dates back to seventh century Germany. So it would make sense if she's part of the final one.