Re: Thor 2 Dark World news, speculation and pictures possible Spoilers - - -
I don't think it is ever outright said. But considering who was hiding it and all the imagery, what I got from the situation that they were an ancient order who worshiped Odin. Perhaps because he proved his "Godliness" and/or saved them at some point. Then at some point he entrusted them with the Cube for whatever reason. Remember, it is "the power of the Gods".