The Holy Grail is an object that serves as an important motif in Arthurian literature. Different versions describe it as a vessel, dish, or stone with miraculous powers providing happiness, eternal youth or food in infinite abundance. A "grail", wondrous but not explicitly holy, first appears in Perceval, le Conte du Graal, an unfinished romance written by Chrétien de Troyes around 1190. Here, it is a processional salver used to serve at a feast. Chrétiens story attracted many continuators, translators and interpreters in the later 12th and early 13th centuries, including Wolfram von Eschenbach, who perceived the grail as a great precious stone that fell from the sky. In the late 12th century, Robert de Boron wrote in Joseph d'Arimathie that the Grail was Jesuss vessel from the Last Supper, which Joseph of Arimathea used to catch Christs blood at the Crucifixion. Thereafter, the Holy Grail became interwoven with the legend of the Holy Chalice, the Last Supper cup, a theme continued in works such as the Vulgate Cycle, the Post-Vulgate Cycle, and Thomas Malorys Le Morte d'Arthur Scholars have long speculated on the origins of the Holy Grail before Chrétien, suggesting that it may contain elements of the trope of magical cauldrons from Celtic mythology with Christian legend surrounding the Eucharist. Other scholars consider the Holy Grail may be the horn of the river-god Achelous described by Ovid in the Metamorphoses.