Aramaic
Eastern dialects

In the eastern regions (from Mesopotamia to Persia), dialects like Palmyrene Aramaic and Arsacid Aramaic gradually merged with the regional vernacular dialects, thus creating languages with a foot in Achaemenid and a foot in regional Aramaic.

In the Kingdom of Osroene, founded in 132 BCE and centred in Edessa (Urhay), the regional dialect became the official language: Edessan Aramaic (Urhaya), that later came to be known as Classical Syriac. On the upper reaches of the Tigris, East Mesopotamian Aramaic flourished, with evidence from the regions of Hatra and Assur.

Tatian the Assyrian (or Syrian), the author of the gospel harmony the Diatessaron came from Adiabene (Syr. Beth-Hadiab), and perhaps wrote his work (172 AD) in East Mesopotamian rather than Classical Syriac or Greek. In Babylonia, the regional dialect was used by the Jewish community, Jewish Old Babylonian (from c. 70 AD). This everyday language increasingly came under the influence of Biblical Aramaic and Babylonian Targumic.

The written form of Mandaic, the language of Mandaeism, was descended from the Arsacid chancery script.
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