The Lorelei, also spelled Loreley, is a large rock on the River Rhine located in Sankt Goarshausen in Nassau, Germany.
In 1801, this rock inspired a ballad by Clemens Brentano called "Die Lore Lay", which speaks of a female sorceress called Lore Lay whom many men fell in love with, leading to their demise. Heartbroken and wishing to die, Lore Lay speaks with a bishop, who himself is charmed by her beauty and advises her to redeem herself by becoming a nun. At the climax of the ballad, Lore Lay climbs to the top of a large rock (i.e. Lorelei) and, seeing a boat, intentionally falls off into the river.
In 1824, Heinrich Heine wrote a poem called "Die Lorelei", where the titular Lorelei is a beautiful maiden sitting atop the rock, combing her hair and singing. Enchanted by the song, sailors crash their ships into the rock. This is similar to the tale of the Sirens in Homer's Odyssey.