Ulmo worked his way with him,
A mortal sent on a journey grim.
At journey’s end a tale of delight
To wed his elven love under an elven night
I have searched many of my files, and have come up empty. Does anyone know the answer to this?
I imagine the answer is Tuor - he is a man therefore mortal.
Ulmo sends him on a dangerous journey to Gondolin to warn the elven king Turgon. Once there he meets the king’s daughter & marries her (elven love).
I would agree with sooth. Here is the entry for Tuor from the Encyclopedia of Arda…
“The son of Huor and cousin to Túrin Turambar, Tuor is renowned as the father of Eärendil the Mariner. In his youth, Tuor journeyed into Nevrast, and there spoke with the Vala Ulmo. Ulmo sent him as messenger to Turgon in Gondolin. Dwelling there, he wedded Turgon’s daughter Idril, who gave birth to Eärendil. After the Fall of Gondolin, he dwelt with the Exiles at the Mouths of Sirion for a time, but feeling old age coming upon him, he built the great ship Eärrámë and sailed into the West with Idril.”