Analysis of information sources in references of the Wikipedia article "Rustamid dynasty" in English language version.
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Here, 'Abd al-Raḥmān in 144/ 761 founded a Khārijī principality based on the newly-founded town of Tahert (Tāhart) (near modern Tiaret), and some fifteen years later he was offered the imamate of all the Ibāḍiyya of North Africa. This nucleus in Tahert was linked with Ibāḍī communities in the Aurès, southern Tunisia and the Jabal Nafūsa, and groups as far south as the Fezzān oasis acknowledged the spiritual headship of the Ibāḍī Imāms.
The Kharijite Rustamid state based at Tahert (western Algeria) was also established by a Persian missionary, ʿAbd al-Rahman b. Rustam of the Ibadi tradition. Their area of influence stretched to Jerba, Jabal Nafusa, and the Fazzan.
The Rustamid (Rustumid, Rostemid) dynasty of Ibadi Kharijite Imam that ruled the central Maghrib as a Muslim theocracy for a century and a half from their capital Tahert in present Algeria until the Ismailite Fatimid Caliphate destroyed it. (...) The exact extent of its dominions is not entirely clear, but it stretched as far east as Jabal Nafusa in Libya.
After the great Kharijite rebellion this encampment developed into the oasis city of Zawila, at the south-eastern extremity of the Kharijite realm of the Rustamids of Tahart.
This shows that the Rustamid princes of Tāhert spoke Arabic, as was to be expected from their Oriental origin, and needed interpreters in their dealings with the Berber-speaking peoples.
