Ibadi imamate of Oman founded by Imam Nasir bin Murshid in 1624 that unified Oman, expelled the Portuguese from Muscat in 1650, and built an Indian Ocean maritime empire seizing Portuguese possessions on the East African Swahili coast (Mombasa, Zanzibar, Kilwa, Pemba) and the Persian Gulf.
Fell after a prolonged succession struggle and civil war that began in 1712; Ahmad bin Said of the Al Bu Said became undisputed ruler of Oman in 1749, founding the Al Bu Said dynasty (already canonical as 'Oman', id: oman, and 'Omani Empire', id: omani_empire).
The Imamate Tradition of OmanJohn C. Wilkinson · 1987
The standard Cambridge University Press scholarly study of the Ibadi imamate of Oman, including the Ya'rubid restoration and its Indian Ocean expansion.
Makran, Oman and Zanzibar: Three-Terminal Cultural Corridor in the Western Indian Ocean, 1799-1856Beatrice Nicolini · 2004
Brill study of the Omani maritime world linking Oman, the Makran coast and Zanzibar - context for the Ya'rubid and successor Busaidi Indian Ocean empire.