The Trucial States (إمارات الساحل المتصالح Āmārāt as-Sāhal al-Matṣālaḥ; also known as Trucial Oman, Trucial States of the Coast of Oman, the Trucial Coast, and the Trucial Sheikhdoms) were a group of sheikhdoms in the Persian Gulf. They were a British protectorate from 1820 until 1971, when they became the United Arab ...