Lohengrin
Lohengrin is a character in some German stories of Arthurian literature. He is the son of Parzival (Percival), he is a knight of the Holy Grail who is sent in a boat pulled by swans to rescue a girl who is falsely accused of murder. He must never tell anyone his name. His story is a version of the Knight of the Swan legend. It is particularly famous now as an opera, Lohengrin by Richard Wagner (1849).
Lohengrin Media
Lohengrin by Walter Crane, 1895
Lohengrin by Ferdinand Leeke, 1916