Life and Lectures of Al-Muayyad-Fid-Din Al-Shirazi
Excerpt:
As an Ismaili missionary he was unrivalled in the field. He was the “daa-e-ud-duat”, the greatest Missionary of the Ismailis. He was always surrounded by the “daa-ees” who used to learn from him the mysteries of the mission and the subtleties of the Ismaili faith.