User blog comment:EvilAngel5/RWBY Character Mysteries/@comment-4830106-20130806184231

Assuming that Ruby was adopted, (and I'm pretty sure she was) I get the sense that she has a hell of a lot of backstory that she doesn't know about. Evidence:

White Cloak, the Cliffside Altar, and "Summer Rose". We know nothing about any of these things, only that they are somehow connected to Ruby.

The first thing that Ozpin says to Ruby in the Pilot is "you have silver eyes". The subject is not pursued. TBH, that line and its possible significance has been getting on my nerves for weeks, the implication being that Ozpin knows more about Ruby's backstory than she does.