By 985, the district's principal towns were Manbij, Alexandretta, Hama, Shaizar, Ma'arrat al-Nu'man, Samosata, Jusiya, Wadi Butnan, Rafaniyya, Lajjun, Mar'ash, Qinnasrin, al-Tinat (possibly ancient Issus), Balis, and Suwaydiyya.
9th century Muslim historian al-Biladhuri says, however, that it was Muawiya's successor Yazid I who founded the district after separating northern territories from Jund Hims.
The newly established district was named after the ancient town of Qinnasrin which was located within its boundaries.
[1] After caliph al-Mansur's conquests of southern Anatolia, Syria's northern frontiers were considerably extended and in 786, during the reign of the Harun al-Rashid, the now-overgrown Jund Qinnasrin was subdivided.
The area toward the northern frontier, comprising the territories of Antioch and the lands east towards Aleppo were split from the district to form Jund al-'Awasim.