1635 The Zaydi imams, who had controlled Yemen in the twelfth century, reassert themselves after the Ottoman departure. They survive a second Ottoman occupation of Sanca in the late nineteenth century and continue to rule today.
1650 Sultan bin Saif al-Yacrubi wins Muscat from the Portuguese, who have occupied the trading port for over 150 years. The Yacrubid imams rule in Oman until 1749.
1663 The Ottoman governor of al-Hasa in the Arabian Peninsula is overthrown. Control of the region reverts to Bedouin chiefs.
18th century A reform movement headed by Muhammad ibn cAbd al-Wahhab (d. 1791) of Najd takes hold in the Arabian Peninsula. This movement stresses the unity of God above all else and holds that the popular faith should be cleansed of all innovations such as the veneration of holy sites and saints.
1741 Muhammad ibn cAbd-al-Wahhab concludes an alliance with local ruler Muhammad ibn Sacud, and out of this military power the present line of Sacudi kings is born. Their allied forces soon conquer the region and launch raids into Iraq, where they feel a heretical form of Islam is practiced.
1749 Ahmad ibn Sacid (r. 174983) begins his career as governor of Suhar in Oman, but soon takes over neighboring cities. His successors supplant the Yacrubids in Muscat, and then expand to Bahrain, cities on the southern Persian coast, and ports in East Africa.
1798 The al-Bu-Sacids counter the threat of the Wahhabis of Najd by signing a treaty with the British East India Company. The company later stations agents at Muscat.