"Trusty John", "Faithful John", "Faithful Johannes", or "John the True" is a German fairy tale collected by the Brothers Grimm and published in Grimm's Fairy Tales in 1819. Andrew Lang included it in The Blue Fairy Book.
It is Aarne-Thompson type... Wikipedia
Originally published: 1819
Authors: Jacob Grimm and Wilhelm Grimm
Also known as: Faithful John, Faithful Johannes, John the Truewww