Elwing
From Tolkien Gateway
Elwing was the daughter of Dior Eluchíl, the heir to the Silmaril of Beren Erchamion, and wife of Eärendil the Mariner. Through the power of the Vala Ulmo she escaped the destruction of the Havens of Sirion in the form of a white bird, and came to her husband on the Sea with the Silmaril upon her breast.