Saif bin Sultan (Arabic: سيف بن سلطان) was the fourth of the Yaruba dynasty Imams of Oman, a member of the Ibadi sect.
Later, many of these were to come under the control of Muhammed bin Uthman al-Mazrui, governor of Mombasa, and his descendants, the Mazrui, who made only nominal acknowledgement of the suzerainty of Oman.
[3][4] According to Samuel Barrett Miles, The Imam Saif bin Sultan was the greatest of the Yaareba Princes, and at no time before or since has Oman been so renowned, powerful or prosperous as under his sway.
Ambition and love of glory, combine with a lust for wealth, were his ruling passions, and in pursuit of these objects he was as unscrupulous and unswerving as he was capable and energetic.
... We hear but little in the local historians of internal troubles and wars during his reign; we may therefore infer that the Imam had the skill and tact to divert the more restless and ambitious spirits from tribal broils, jealousies and dissensions by employing them in piratical and other expeditions, and in encouraging them to venture their trading operations in distant regions, for it is beyond question that under his auspices the commerce of Oman greatly extended and developed.