That ruler who had this inscription created was a lance-bearer for a previous king and rose to power after killing Bardiya.
Study of this document by the Ahnenerbe was cancelled due to the onset of WWII. This document records that upon his defeat, the rebel Phraortes had his nose, ears, tongue, and an eye removed and was displayed in chains outside the palace before being crucified. This document describes a river crossing made on horses, camels, and inflated skins to attack the army of Nidintu-Bel. This document justifies the position of the ruler who ordered it created by claiming that he saved the kingdom from the possibly fictional usurper (*) Gaumata. That ruler who had this inscription created was a lance-bearer for a previous king and rose to power after killing Bardiya. This inscription says that anyone who destroys it will be smote by Ahura Mazda. For 10 points, this is what inscription detailing the exploits of Darius I that was crucial in the decipherment of cuneiform?
Study of this document by the Ahnenerbe was cancelled due to the onset of WWII.
Behistun Inscription (accept Bisutun, Bisotun, Bagastana, or Bistun)