This study introduced a newly discovered tombstone inscription from the Poushanj desert cemetery in Darab. The tombstone inscription dates back to the ninth century (877 AH), when Uzun Hasan Aq Qoyunlu rule the region. The deceased man is called Malek Mo’ayyed al-Bazgir. The term “bazgir” may be transformed form of “bazhgir” and “bajgir” that was a bureaucratic job related to tax collection. More likely, this term alludes to the name of “Bazgir Tribe” who lived in western Iran. Historical documents do not show any record of the presence of the people of this tribe in southern Iran. Relying historical sources and documents, this study tried to explore the historical identity of the deceased person in Darab. Considering the title “Malek” before the name of the deceased man, two hypotheses were proposed regarding the reason for this individual’s presence in Darab. The first hypothesis was that after Uzun Hasan’s conquest of Lorestan and defeating Shah Rostam (one of the moluks of “Atabakan Lor-e-Kuchak”), the deceased man as one of the leaders of the Lor rule was sent or exiled to Darab. The second hypothesis was formed based on the occurrences during the reign of another ruler of Lorestan (Shah Hossein), father of Shah Rostam. This ruler was killed in Hamadan in 873 AH over a fight against people of Baharlou tribe. The presence of officials of the Baharlou tribe in Fars during the Qara Qoyunlu period, before the Safavid era, is probable. Accordingly, it is possible that the deceased man had been captured over the fight of the Lor ruler against the Baharlou in Hamadan and sent to Darab. Moreover, this tombstone inscription was explored as a valuable document for determining the approximate date of the end of the socio-political life of Darabjerd city and the beginning of the social life of Darab city. Examining the inscriptions of the tombstone inscriptions, taking a comparative historical method, and relying on library sources, this study tried to identify the historical identity of the deceased man.