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Darius the Great standardized Aramaic, which became the Imperial Aramaic script. This Imperial Aramaic alphabet rapidly spread: west, to the Kingdom of Nabataea, then to the Sinai and Arabian peninsulas, eventually making its way to Africa; and east, where it later influenced the development of the Brahmi script in India. Over the next few centuries, Imperial Aramaic script in Persia evolved into Pahlavi, "as well as for a range of alphabets used by early Turkish and Mongol tribes in Siberia, Mongolia and Turkestan".[1] During this period, literacy spread among the merchant classes, and 15-20% of the total population may have been literate.[citation needed]