From Leonard Cohen's "Halleluj'ah":
Baby, I've been here before --
I know this room, I've walked this floor:
I used to live alone before I knew you.
I've seen your flag on the marble arch:
Love is not a victory march;
It's a cold and it's a broken Hallelujah.
I believe I have a clear and coherent understanding of this song, with the exception of one line: "I've seen your flag on the marble arch." Based on my understanding of Cohen's work as a whole, I am all but certain that it is a reference to something in the Jewish Scriptural canon, possibly from the Prophets or from later Jewish history. However, my lack of knowledge prevents me from identifying the reference. Can anyone else?