"Erlkönig" is a poem by Johann Wolfgang von Goethe. It depicts the death of a child assailed by a supernatural being, the Erlking, a king of the fairies. It was originally written by Goethe as part of a 1782 Singspiel, Die Fischerin.
"Erlkönig" illustration, Moritz von Schwind
The Erlking by Albert Sterner, ca. 1910
Title page of the first edition of Schubert's "Erlkönig"
In European folklore and myth, the Erlking is a sinister elf who lingers in the woods. He stalks children who stay in the woods for too long, and kills them by a single touch.
Statue depicting the Erlking in the ancient graveyard of Dietenhausen, in Keltern, Germany.
Monument to Goethe's "Erlkönig" in Jena at the place where the rider in the poem supposedly met the Erlkönig