The Aramaic alphabet is historically significant since virtually all modern Middle Eastern writing systems can be traced back to it as well as numerous non-Chinese writing systems of Central and East Asia.[citation needed] That is primarily from the widespread usage of the Aramaic language as both a lingua franca and the official language of the Neo-Assyrian and Neo-Babylonian Empires, and their successor, the Achaemenid Empire. Among the scripts in modern use, the Hebrew alphabet bears the closest relation to the Imperial Aramaic script of the 5th century BC, with an identical letter inventory and, for the most part, nearly identical letter shapes. The Aramaic alphabet was an ancestor to the Nabataean alphabet and the later Arabic alphabet.