When "sultan" is commonly used in Islamic contexts, the person ruler's adherence to Islam may perhaps fluctuate. Sultanate of Zanzibar: two incumbents (within the Omani dynasty) since the de facto separation from Oman in 1806, the last assumed the title Sultan in 1861 at the formal separation below British auspices;[citation https://hectorxkuep.yomoblog.com/38846123/the-2-minute-rule-for-sultan66