He appeared before Tuor and urged him to go to Gondolin as a messenger to Turgon; when he got there he eventually married Turgon's daughter Idril and fathered Eärendil; Ulmo saved Eärendil's wife Elwing from the sack of the Havens of Sirion, allowing her to take a Silmaril to her husband, which allowed him to gain admittance to Valinor and plead for aid.
Her conflict with Morgoth over the Silmaril was the subject of Blind Guardian's song "Into the Storm", from their 1998 album Nightfall in Middle-Earth.
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Afterward the light of the trees persisted only within the Silmarils of Fëanor.