Flecker (poet). Flecker's "The Bridge of Fire" has six stanzas numbered I-VI. In The Sandman: The Wake, Gaiman, very appropriately, quotes stanza VI, beginning:
"Between the pedestals of Night and Morning..."
In Island In The Sea Of Time, Stirling quotes stanza I, beginning:
"High on the bridge of Heaven..."
- and then also quotes stanza VI.
Consulting my The Collected Poems of James Elroy Flecker (see image), I see that stanza V lists several gods, including our old friend, Mithras. Also of possible interest here is an sf poem, "To a Poet a Thousand Years Hence," (here) ending:
"O friend unseen, unborn, unknown,
"Student of our sweet English tongue,
"Read out my words at night, alone:
"I was a poet, I was young.
"Since I can never see your face,
"And never shake you by the hand,
"I send my soul through time and space
"To greet you. You will understand."