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Ottor Wǽfre, the son of Eoh, was born in Angeln, between the Flensburg Fjord and the Schlei River. After his father was killed by his uncle, Beorn, he fled to the island Heligoland where he married Cwén. He is the father of Hengest and Horsa, who later become great chiefs of their people.
While sailing the Sea, Ottor followed the directions of an old man who turned out to be Ulmo, and was cast away on Tol Eressea. He was welcomed by the Elves there who gave him the name Eriol Sarothron ("Lone dreamer" and "Voyager") also called Angol (after the "iron cliffs" of his home). Lindo hosted him in the Cottage of Lost Play of Kortirion where they were celebrating the Turuhalmë.
 Other versions of the legendarium
The story follows Ottor's exploration of the Isle and meeting with the Elves who are willing to narrate their lore about the creation of the world, the origins of Elves, Dwarves and Men, their wars against the Enemy and the origins of Luthany (Britain); each Elf narrates another part of the history, forming what would be consist The Silmarillion decades later.
Later in the story, Ottor narrates his own background and how he came to arrive to Eressea; the Elves also tell him their prophecies concerning their return to Luthany and the rekindling of the Two Trees.
The names of Ottor's sons are significant to the historical context of the Eriol story. In British folklore, Hengest and Horsa are the legendary leaders of the Anglo-Saxon invasion of Britain in the 5th century. By connecting them to the translator of the Lost Tales, Tolkien would have established a direct link between his legendarium and the Matter of Britain.
In later works of Tolkien, the figure of Eriol was renamed Ælfwine and was given a different background. Rather than a Saxon of the 5th century (predating the establishment of England), Ælfwine is revised as an Anglo-Saxon citizen of 10th century England. However, neither Eriol nor Ælfwine appear in the published Silmarillion.