 They were mostly inscriptions from the time period of Darius I, such as the DNa inscription, as well as his son, Xerxes I.Later kings down to Artaxerxes III used more recent forms of the language classified as "pre-Middle Persian".Old Persian cuneiform is loosely inspired by the Sumero-Akkadian cuneiform; however, only one glyph is directly derived from it - "l(a)" (), from "la" ().