The Yarubid dynasty were rulers of Oman between 1624 and 1742, holding the title of Imam. They expelled the Portuguese from coastal strongholds in Muscat and united the country. They improved agriculture, expanded trade and built up Oman into a major maritime power. Their forces expelled the Portuguese from East Africa and established long-lasting settlements on Zanzibar, Mombasa and other parts of the coast. The dynasty lost power during a succession struggle that started in 1712 and fell after a prolonged period of civil war.

The Omani Empire was a maritime empire, vying with Portugal and Britain for trade and influence in the Persian Gulf and Indian Ocean. After rising as a regional player in the 18th century, the empire at its peak in the 19th century saw its influence or control extend across the Strait of Hormuz to modern-day Iran and Pakistan, and as far south as Cape Delgado. After the death of Said bin Sultan in 1856 the empire was divided between his sons into two sultanates, an African section ruled by Majid bin Said and an Asian section ruled by Thuwaini bin Said.