2Heaney, Seamus. "Ocean's Love to Ireland." Irish University Review 4.2 (1974): 199-200.
The lines in the poem, "as gallant and good / Personages as ever were beheld," are quoted by Heaney from what were reported as Lord Grey's remarks when is he saw the bodies of the 600 slain prisoners “stripped and laid out upon the sands.” (Pope-Hennessy, John. Sir Walter Raleigh in Ireland. London: K. Paul, Trench, &, 1883.) The Heaney poem may be read in its entirety here.