Yusuf ibn Ahmed al-Bahrani was a Bahraini theologian and a key figure in the intellectual development of Twelver Shia Islam. Al-Bahrani grew up in Safavid-ruled Bahrain, at a time of intellectual ferment between Akhbari and UsuliShi'ah Islam. His family were Usuli clerics who also worked as pearl merchants. The 1717 Omani invasion of Bahrain forced him and his family to flee, first to Qatif, then to Mecca and then Shiraz, before he eventually settled in Karbala. In Karbala he became the prestigious dean of the Shi'i scholarship and as such presided over the religious establishment. Al-Bahrani adopted the Akbhari school, rejecting his early Usuli schooling in Bahrain. Al-Bahrani's thought evolved from a strict Akhbarism to a position that adopted some Usuli elements; he became his generation's chiefproponent of the neo-Akhbari creed. Nevertheless, he rejected Usuli principles of legal reasoning, the syllogistic logic Usulis allowed in interpreting the law, and the legitimacy of holy war during the Occultation of the Imam. Historian Juan Cole summarises al-Bahrani's thought as:It has been proposed by that al-Bahrani may have found the state-centric Usulism less appealing given the political turmoil he had experienced throughout his life: first as a refugee from his homeland and then again when the Safavids were deposed by Afghan invaders. Cole gives three reasons for the triumph of Akhbarism in Bahrain over the Usulis: the invasions of Bahrain and Safavid Iran by Omanis and Afghans respectively, which undermined the state centric Usulism; a generational gap that appeared at the end of the seventeenth century in strict Usuli families with sons disappointed at the Usuli clerics' failure to meet the Omani and Afghan challenges; and geographical divisions emerged between Diraz where al-Bahrani's influence was strongest and the old Safavid Usuli centre of Bilad Al Qadeem. In Karbala, al-Bahrani and his followers continued the intellectual debate with Usulism that has spurred Bahrain's intellectual vitality. Under al-Bahrani's influence Karbala was dominated by Arab ulema-merchants, although the first Usuli cell was founded by Iranian cleric Muhammad Baqir Behbahani in the 1760s. Behbahani gradually became more confident, and with a growing number of students as well as wealth from relatives in Iran and India, he began to challenge al-Bahrani, eventually succeeding him as the dominant intellectual in Karbala when al-Bahrani died in 1772. Al-Bahrani edited numerous books, including Lu’lu’at al-Baḥrayn "The Pearl of Bahrain", a biographical dictionary of Shia scholars, the last chapter of which was his autobiography.