So I was reading a deposition this week, and during a discussion on an objection, one attorney said to the other, it is basically the key to the elgin marbles. I did not understand the reference and so looked it up.
It turns out that the elgin marbles are artwork taken from the parthenon by an english man named elgin. He had the permission of the turkish government which at that time was in possession of greece. There is a lot of conflict over whether the english should return the artwork to greece or not.
Here is the wiki article on the elgin marbles. However, this does not solve the problem. There is no reference to the key of the elgin marbles. I googled the phrase key to the elgin marbles. I have theories on what it could mean, but if anyone knows what that phrase actually means, I would appreciate a comment telling me.