Overview: Middle Persian, often called Pahlavi and known natively as Pārsik, was the prestige language of southwestern Iran in late antiquity. It developed from earlier Old Iranian speech and is classified within the Western (southwestern) group of Iranian languages. The language was spoken in regions such as Khuzestan and Lorestan and more widely across the Sassanian state, whose political centre was in what is now Iran. Middle Persian served as the court, administrative and literary language during the Sassanian era and is the principal ancestor of contemporary Modern Persian.
Linguistic characteristics
Compared with Old Iranian stages, Middle Persian shows marked simplification of morphology: case endings for nouns largely disappeared and verb systems became increasingly analytic, using periphrastic constructions and auxiliaries. Consonant and vowel developments produced sound changes that distinguish it from Old forms. Middle Persian also attests features such as enclitic pronouns and a productive derivational morphology. Its vocabulary includes inherited Iranian stock as well as borrowings and technical terms adopted through contact with other languages.
Writing systems and textual evidence
The language appears in several scripts. The conventional Pahlavi script used in many Zoroastrian manuscripts was derived from Aramaic and is notable for its use of Aramaic heterograms — Aramaic words written but read as Middle Persian. In addition to Book Pahlavi and Inscriptional Pahlavi, religious communities such as the Manichaeans produced texts in related scripts. Epigraphic remains, coins, administrative documents and a substantial corpus of religious and exegetical literature preserve Middle Persian for modern study. These materials are central to research in Sassanian history and philology.
History, literature and religion
Middle Persian rose to prominence during the Sassanian dynasty (third to mid-seventh century CE) as the language of government and learned culture. Much Zoroastrian theological, legal and exegetical literature was transmitted in Middle Persian, and Manichaean scriptures and community records also survive in related Middle Iranian varieties. After the Arab conquests the spoken language continued to change and gradually developed into New or Modern Persian, while Middle Persian remained in use within certain religious and scholarly traditions.
Legacy and influence
As a bridge between older Old Iranian varieties (including material tied to Old Persian) and later Persian, Middle Persian is key to understanding the linguistic evolution of the Iranian languages. Its vocabulary, religious concepts and administrative terminology influenced neighbouring dialects and later literary Persian. Modern scholarly overviews and regional surveys treat Middle Persian as an essential subject in the study of Iranian philology and late antique cultural history (regional surveys, national histories, Sassanian studies, ancient inscriptions, modern linguistic overviews).