Whilst "sultan" is often Employed in Islamic contexts, the person ruler's adherence to Islam could range. Sultanate of Zanzibar: two incumbents (from your Omani dynasty) Because the de facto separation from Oman in 1806, the last assumed the title Sultan in 1861 within the formal separation under British auspices;[citation desired] https://sultan-6667665.activablog.com/31658190/detailed-notes-on-sultan66