"Lohengrin" is an opera composed by Richard Wagner, first performed in 1850. The story is based on a medieval legend and follows the knight Lohengrin, who arrives to rescue Elsa from false accusations of murder. He offers her protection but imposes a mysterious condition: she must never ask about his origins. The opera is known for its beautiful music, including the famous "Bridal Chorus." It explores themes of love, loyalty, and the conflict between faith and doubt. "Lohengrin" is often performed in opera houses around the world and remains a significant work in the classical music repertoire.