The Sanaa palimpsest (also Ṣanʽā’ 1 or DAM 01-27.1) or Sanaa Quran is one of the oldest Quranic manuscripts in existence. Part of a sizable cache of Quranic and non-Quranic fragments discovered in Yemen during a 1972 restoration of the Great Mosque of Sanaa, the manuscript was identified as a palimpsest Quran in 1981; as it is written on parchment and comprises two layers of text. The upper text largely conforms to the standard 'Uthmanic' Quran in text and in the standard order of chapters (suwar, singular sūrah); whereas the lower text (the original text that was erased and written over by the upper text, but can still be read with the help of ultraviolet light and computer processing) contains many variations from the standard text, and the sequence of its chapters corresponds to no know