The Prophecy of Melkin is a medieval text about an alleged hidden grave of Joseph of Arimathea at Glastonbury in England, containing the Holy Grail.
It is contained in a local chronicle (Cronica sive antiquitates Glastoniensis ecclesiae) written by John of Glastonbury in the mid-14th century, who attributes it to an alleged Celtic bard named Melkin, said to have lived "before Merlin".
It is thought to have been created in the context of legends that linked Joseph of Arimathea with the mythical Avalon, Glastonbury and the court of King Arthur, which had arisen in England in the mid-13th century.
[1] The legend may have been partly based on an older narrative of how the discovery of the alleged grave of King Arthur at Glastonbury, in c. 1191, had been foretold by an ancient Welsh bard, mentioned by Gerald of Wales around 1193.
A. Robinson, runs as follows: Amid these Joseph in marble Of Arimathea by name Hath found perpetual sleep And he lies on a two-forked line Next the south corner of an oratory Fashioned of wattles For the adoring of a mighty Virgin