 The 1967 translation of the Rubáiyat by Robert Graves and Omar Ali-Shah, however, created a scandal.The authors claimed it was based on a twelfth-century manuscript located in Afghanistan, where it was allegedly utilized as a Sufi teaching document.But the manuscript was never produced, and British experts in Persian literature were easily able to prove that the translation was in fact based on Edward Heron Allen's analysis of possible sources for FitzGerald's work.