Shahriyar IV

Shahriyar IV شهریار
Coin of Shahryar IV.
King of Mazandaran
Reign	1074–1114
Predecessor	Qarin II
Successor	Qarin III
Born	1039 Mazandaran
Died	1114 (aged 74 or 75) Tamisha, Mazandaran
Issue	Qarin III Ali I Rustam Yazdagird Bahram
Dynasty	Bavand dynasty
Father	Qarin II
Religion	Twelver Shia Islam

Shahriyar IV (Persian: شهریار‎‎), also known as Husam al-Dawla (حسام الدوله), was the king of the Bavand dynasty of Mazandaran, ruling from 1074 to 1114.

After having succeeded his father Qarin II in 1074, Shahriyar IV immediately moved the capital to Sari, which it would remain till 1210. A few decades later, he briefly waged a war against his overlords, the Seljuk Empire. Peace was made, and Shahriyar IV's son Qarin III married a daughter of the Seljuk Sultan Muhammad I.

Shahriyar IV's rule was shortly usurped by Qarin III, who, however, eventually restored him as king. Shahriyar, old and ill, spent the rest of his reign as a figurehead, whilst Qarin III was the de facto ruler of the kingdom, and finally ascended the throne after Shahriyar IV's death in 1114.

Shahriyar was born in 1039, and in 1074, he ascended the Bavandid throne, taking the traditional title of ispahbadh of Mazandaran. He also moved the Bavand capital to Sari. Like his father, Shahriyar IV was a vassal of the Seljuk Empire.

In 1106, the Seljuk Sultan Muhammad I conquered the Ismaili fortress of Shahdiz, and ordered Shahriyar to participate in the campaign against Ismailis. Shahriyar, greatly angered and feeling offended by the message Muhammad sent him, refused to aid him against the Ismailis. Shortly after the sultan sent an army headed by Amir Chavli into Mazandaran. Shahriyar shortly called upon the aid of his vassals, which included the Qarinvand ruler Amir Mahdi. Shahriyar was also joined by his son Qarin III. He shortly defeated the army of Amir Chavli. Muhammad then sent a letter, which requested Shahriyar to send one of his sons child to the Seljuk court in Isfahan. He sent his son Ali I, who impressed Muhammad so much that he offered him his daughter in marriage, but Ali refused and told him to grant the honor to his brother and heir of the Bavand dynasty, Qarin III. Qarin III then went to Isfahan court and married her. After his return to Sari, however, he began claiming the Bavand throne for himself, and started abusing his father Shahriyar and his servants. Shahriyar then moved to Amol and later Rudsar, where he built a Khanqah, and devoted himself to religion. However, when he got sick, Qarin III apologized and restored him as the ruler of the Bavand dynasty.