How did Achaemenian kings use Old Persian cuneiform inscriptions?

Achaemenian kings primarily utilized Old Persian cuneiform for monumental writing to project imperial power and record royal achievements. Because the empire was highly international, these inscriptions were frequently trilingual, featuring Old Persian alongside Akkadian and Elamite versions.123

Kings such as Darius I and Xerxes I inscribed these texts on diverse surfaces, including rock faces, building walls, columns, statues, and various portable items like gold and silver plates. These inscriptions served several key functions:2

• Legitimization: Texts like the Bisotun inscription acted as self-statements, detailing how a ruler gained and consolidated power, often depicting the king triumphant over rebels.2
• Commemoration: Inscriptions recorded significant imperial projects, such as the opening of a canal connecting the Red Sea to the Nile.2
• Genealogy: The introductory lines of these texts typically established the ruler's name, titles, and lineage, reinforcing their authority.1

While Old Persian cuneiform was used for these monumental displays, it was not the primary language of daily administration, which relied more heavily on Elamite and Aramaic.3