Sultan bin Saif bin Malik was the second of the Yaruba dynasty of Imams of Oman, a member of the Ibadi sect. He ruled from 1649 to 1679. He completed the work of his predecessor, Nasir bin Murshid, in driving the Portuguese out of Oman. Their last base in Muscat fell to his forces in January 1650. He built up Omani sea power, taking the fight against the Portuguese to their bases in India and East Africa. During his reign the country was peaceful and increasingly prosperous.

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.