Oh, the torment bred in the race, the grinding scream of death and the stroke that hits the vein, the haemorrhage none can staunch, the grief, the curse no man can bear. (avada kedavra curse?)

But there is a cure in the house and not outside it, no, not from other but from them, (the Dursleys?) their bloody strife. We sign to you, dark gods beneath the earth. (the protection of death, of lily's blood living in her sister?)

Now hear, you blissful powers underground - answer the call, send help. Bless the children, give them triumph now. (the echoes of the dead... during Book 4 "priori incantatem", and the dead walking with Harry in Chapter 34, Book 7?)

Aeschylus, The Libation Bearers

I'm actually glad I stuck with it. I wanted to work it out and find a relevance. Do you think JK had those extracts in mind at the beginning of the whole series?