When Chretien de Troyes (twah) left this work unfi
When Chretien de Troyes (twah) left this work unfinished at his  death, Wolfram von Eschenbach rewrote and completed it in German.  Along the way, Eschenbach changed the title character's quest  object to a stone tray which supplied the bearer with all manner of  meats and alcohol. FTP, name this tale about an Arthurian knight  in pursuit of the Holy Grail, which Richard Wagner later adapted  for opera.
When Chretien de Troyes (twah) left this work unfinished at his  death, Wolfram von Eschenbach rewrote and completed it in German.  