Friedrich Münter Bishop of Copenhagen improved over the work of Tyschen, and proved that the inscriptions must belong to the age of Cyrus and his successors, which led to the suggestion that the inscriptions were in the Old Persian language and probably mentioned Achaemenid kings. He suggested that the long word appearing with high frequency and without any variation towards the beginning of each inscription () must correspond to the word "King", and that repetitions of this sequence must mean "King of Kings". He correctly guessed that the sequence must be pronounced "kh-sha-a-ya-th-i-ya", a word of the same root as the Avestan "xšaΘra-" and the Sanskrit "kṣatra-" meaning "power" and "command", and now known to be pronounced "xšāyaϑiya".