German surveyor Carsten Niebuhr visited in around 1764 for Frederick V of Denmark, publishing a copy of the inscription in the account of his journeys in 1778. Niebuhr's transcriptions were used by Georg Friedrich Grotefend and others in their efforts to decipher the Old Persian cuneiform script. Grotefend had deciphered ten of the 37 symbols of Old Persian by 1802, after realizing that unlike the Semitic cuneiform scripts, Old Persian text is alphabetic and each word is separated by a vertical slanted symbol.