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.