I was just reading your Dublin book, looking for your take on the tombs at Bremore;
"Like the Boyne to the north, which receives far more attention due to the three amazing tombs at Newgrange, Knowth and Dowth, the River Delvin must have once been an important river to the passage tomb builders."
I think the Bremore tombs could well have been amongst the first in the Boyne Valley complex along with the few other within spitting distance.