Rustam Dushmanziyar

Rustam Dushmanziyar was a Dailamite aristocrat and the ancestor of the Kakuyid dynasty. His real name was Rustam but was known as Dushmanziyar, which is the Arabized version of Dushmanzar, meaning "he who brings grief to his enemy".

Biography
Rustam was the brother of the wife of the Buyid ruler Fakhr al-Dawla, Sayyida Shirin, who was brother, or most likely, the niece of the Bavandid ruler Al-Marzuban. Rustam also had a son named Muhammad ibn Rustam Dushmanziyar, who would later establish the Kakuyid dynasty of Isfahan.

Rustam, because of his great service to Fakhr al-Dawla, he was rewarded with land in Alborz in appreciation of his services. His duty was to protect Ray and northern Jibal against the local leaders from Tabaristan. Rustam later died at an unknown date before 1007, which was the date Muhammad ibn Rustam Dushmanziyar established the Kakuyid dynasty.