Reverend William St. Clair-Tisdall served as the Secretary of the Church of England's Church Missionary Society in Isfahan Persia. Rev. Tisdall was fluent in several languages and spent much time researching the sources of Islam and the Qur'an in the original languages. His works provide an important foundation for the study of Islam and the Qur'an through their analysis of the sources of Muhammad's ideas.

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