The poem
Poem: A Vision
Two crowned Kings, and One that stood alone With no green weight of laurels round his head, But with sad eyes as one uncomforted, And wearied with man's never-ceasing moan For sins no bleating victim can atone, And sweet long lips with tears and kisses fed. Girt was he in a garment black and red, And at his feet I marked a broken stone Which sent up lilies, dove-like, to his knees. Now at their sight, my heart being lit with flame, I cried to Beatrice, 'Who are these?' And she made answer, knowing well each name, 'AEschylos first, the second Sophokles, And last (wide stream of tears!) Euripides.'

I have to explicate this for a project. Any ideas on the meaning of line 5. Also, additional insights into allsion? (besides jesus?)