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Literary forerunners

The story is similar to the German folktale "Peter Klaus"^[4] by J. C. C. Nachtigal, which is a shorter story set in a German village.

The story is also similar to the ancient Jewish story about Honi M'agel who falls asleep after asking a man why he is planting a carob tree which traditionally takes 70 years to mature, making it virtually impossible to ever benefit from the tree's fruit. After this exchange, he falls asleep on the ground and is miraculously covered by a rock and remains out of sight for 70 years. When he awakens, he finds a fully mature tree and that he has a grandson. When nobody believes that he is Honi, he prays to God and God takes him from this world.

The story is also similar to a 3rd century AD Chinese tale of Ranka, as retold by Lionel Giles in A Gallery of Chinese Immortals, and an 8th-century Japanese tale, "Urashima Tarō".

In Orkney there is a similar and ancient folklore tale linked to the Burial mound of Salt Knowe adjacent to the Ring of Brodgar. A drunken fiddler on his way home hears music from the mound. He finds a way in and finds the trowes (Trolls) having a party. He stays and plays for two hours, then makes his way home to Stenness, where he discovers fifty years have passed. The Orkney Rangers believe this may be one source for Washington Irving's tale, because his father was an Orcadian from the island of Shapinsay and would almost certainly have often told his son the tale.

And in Ireland there is the story of Niamh and Oisin, which deals with a similar theme. Oisin falls in love with the beautiful Niamh and leaves with her on her snow white horse to Tir Na nOg - the land of the ever-young. Missing his family and friends, he asks to pay them a visit. Niamh lends him her horse, warning him never to dismount, and he travels back to Ireland. But three hundred years have passed; his family and fellow warriors are all dead. Some men are trying to move a boulder. Oisin reaches down to help them. The girth of the horse's saddle snaps and he falls to the ground. Before the watching eyes of the men he becomes a very, very old man.

Another story was by Diogenes Laertius, an Epicurean philosopher circa early half third century, in his book On the Lives, Opinions, and Sayings of Famous Philosophers. The story is in chapter ten in his section on the Seven Sages, who were the precursors to the first philosophers. The sage was Epimenides. Apparently Epimenides went to sleep in a cave for fifty-seven years. But unfortunately, "he became old in as many days as he had slept years". Although according to the different sources that Diogenes relates, Epimenides lived to be one hundred and fifty-seven years, two hundred and ninety-nine years, or one hundred and fifty-four years old.^[9]

A similar story is told of the Seven Sleepers of Ephesus, Christian saints who fall asleep in a cave while avoiding Roman persecution and awake more than a century later to find that Christianity has become the official religion of the Empire.