Mah-Adhur Gushnasp, also known by the Arabicized form of Mahadharjushnas, was a Sasanian nobleman who served as the wuzurg framadār (vizier or prime minister) of the Sasanian Empire during the reign of the child ruler Ardashir III.
Mah-Adhur is first mentioned in 628, he, along with his brother Narsi, was the son of a certain Jushnas, and an unnamed Ispahbudhan noblewoman, who was the sister of Vistahm and Vinduyih. Mah-Adhur was elected as wuzurg framadār of the Sasanian Empire after Ardashir III's accession, and administered it greatly, which Al-Tabari says the following thing about: "Mahadharjushnas carried on the administration of the kingdom in [such] an excellent fashion, [and with such] firm conduct, [that] no one would have been aware of Ardashir III's youthfulness." According to some other sources, Mah-Adhur was the cousin of Khosrau II. One year later, Shahrbaraz with a force of 6,000 men marched towards Ctesiphon and besieged the city. Shahrbaraz, however, was unable to capture the city, and then made an alliance with Piruz Khosrow, the leader of the Parsig faction, and the previous wuzurg framadār of the Empire during the reign of Ardashir's father, Kavadh II. He also made an alliance with Namdar Jushnas, the spahbed of Nimruz. Shahrbaraz, with the aid of these two powerful figures, captured Ctesiphon and executed Ardashir III, along with Mah-Adhur himself, including other Sasanian nobles like Ardabīl. Forty days later, Shahrbaraz was murdered by Farrukh Hormizd, who then made Borandukht, the daughter of Khosrau II, ascend the throne.
Mah-Adhur's two sons, Qubad and Anushjan, later clashed with the Arabs three times in 633, first at the battle of Chains, then at battle of River, and finally at the battle of Madhar, where they were killed by the Arab general Khalid ibn al-Walid.
- Pourshariati (2008), p. 179
- ARDAŠĪR III, A. Sh. Shahbazi, Encyclopaedia Iranica,(11 August 2011).
- Pourshariati (2008), p. 180
- Pourshariati (2008), pp. 193-194
- Pourshariati, Parvaneh (2008). Decline and Fall of the Sasanian Empire: The Sasanian-Parthian Confederacy and the Arab Conquest of Iran. London and New York: I.B. Tauris. ISBN 978-1-84511-645-3.
- Shapur Shahbazi, A. (1986). "ARDAŠĪR III". Encyclopaedia Iranica, Online Edition. Retrieved 5 December 2013.