The Manichaean script is an abjad-based writing system rooted in the Semitic family of alphabets and associated with the spread of Manichaeism from southwest to central Asia and beyond, beginning in the 3rd century CE. It bears a sibling relationship to early forms of the Pahlavi script, both systems having developed from the Imperial Aramaic alphabet, in which the Achaemenid court rendered its particular, official dialect of the Aramaic language. Unlike Pahlavi, Manichaean script reveals influences from Sogdian script, which in turn descends from the Syriac branch of Aramaic.