The Buyid brothers were a prominent Persian dynasty that ruled parts of Iran and Iraq during the 10th and 11th centuries. They were known for their military prowess and played a significant role in the political landscape of the Islamic world after the decline of the Abbasid Caliphate. The brothers, Ali, Hassan, and Ahmad, established their power by capturing key cities, including Baghdad. The Buyid dynasty is notable for its contributions to Persian culture and administration. They promoted the use of the Persian language and supported the arts, leading to a cultural revival in the region. Their rule marked a transition from Arab to Persian dominance in the Islamic world.