Hasan (died September 976), better known by his laqab as Rukn al-Dawla (Persian: رکنالدوله دیلمی), was the first Buyid amir of northern and central Iran (c. 935–976). He was the son of Buya.
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Rukn al-Dawla in the context of Buyid dynasty
The Buyid dynasty or Buyid Empire was a Zaydi and later Twelver Shi'a dynasty of Daylamite origin. Founded by Imad al-Dawla, they mainly ruled over central and southern Iran, and Iraq from 934 to 1062. The Buyids, together with the rise of other Iranian dynasties in the region, represents a period in Iranian history sometimes referred to as the Iranian Intermezzo.
The Buyid dynasty was founded by Ali ibn Buya, who in 934 conquered Fars and made Shiraz his capital. He received the laqab or honorific title of Imad al-Dawla (lit. 'Fortifier of the State'). His younger brother, Hasan ibn Buya (r. 935–976) conquered parts of Jibal in the late 930s, and by 943 managed to capture Ray, which he made his capital. Hasan was given the laqab of Rukn al-Dawla (lit. 'Pillar of the State'). In 945, the youngest brother, Ahmad ibn Buya, conquered Iraq and made Baghdad his capital. He was given the laqab Mu'izz al-Dawla.
Rukn al-Dawla in the context of Bisutun
Bisutun (بيستون) (died 977) was the ruler of the Ziyarids (967–977). He was the eldest son of Vushmgir.
During his father's lifetime, Bisutun was the governor of Tabaristan Amol. Upon Vushmgir's death in 967 during a hunting expedition, he went to Gurgan to assume power. His ascension was contested, however, by a Samanid army which had arrived shortly before Vushmgir's death for a joint campaign against the Buyid Rukn al-Dawla. The army commander supported making Bisutun's brother Qabus as ruler of the Ziyarids. Bisutun then turned to Rukn al-Dawla, recognizing the latter's sovereignty in an attempt to gain support. The Samanid army soon left Gurgan, returning to Khurasan, but Qabus found the support of al-Hasan ibn al-Fairuzan, who was ruling in Simnan at that time. Bisutun eventually managed to conquer both Gurgan and Simnan, forcing Qabus to give up his claims.
Rukn al-Dawla in the context of Imad al-Dawla
Ali ibn Buya (Persian: علی بن بویه, Arabic: علي بن بویه), commonly known by his laqab (honorific epithet) Imad al-Dawla (عمادالدوله; c. 891/2 – December 949), was the founder of the Buyid amirate of Fars, ruling as its amir (ruler) from 934 to 949. Together with his two younger brothers, Rukn al-Dawla and Mu'izz al-Dawla, he established a triumvirate, centered on Ray, Shiraz and Baghdad.