He returned to Oman in 1966 and was the subject of sizeable constraints from his father. In 1970, Qaboos ascended to the Omani throne following overthrowing his father in a coup d'état, with British assist. The place was subsequently renamed the Sultanate of Oman. Sultanate of Zanzibar: two incumbents (from https://sultan66king00998.blogerus.com/54776488/the-definitive-guide-to-sultan66king