The History of Middle-earth
Ælfwine the mariner is a fictional character found in various early versions of J. R. R. Tolkien's Legendarium. Tolkien envisaged Ælfwine as an Anglo-Saxon who visited and befriended the Elves and acted as the source of later mythology. Thus, in the frame story, Ælfwine is the stated author of the various translations in Old English that appear in the twelve-volume "The History of Middle-earth" edited by Christopher Tolkien.