Comparative Examination of Function of al-Ḥasan b. Zayd with al-Ḥasan b. ‘Alī al-Uṭrūsh with Emphasis on Religious and Cultural Approach

Al-Ḥasan b. Zayd known as al-Da‘ī al-Kabīr (r. 250-270 AH) and al-Ḥasan b. ‘Alī known as al-Nāṣir al-Kabīr (r. 301-304 AH) have paid attention to the subject of religion and the progress of Zaydī Shiism in their ruling period in Tabaristan and Daylam; but because of historical and personality-concerned conditions of those two, al-Da‘ī al-Kabīr from political perspective and al-Nāṣir al-Kabīr in religious and cultural terms have had more and more successful activity. Thus, the aim of the present essay is the examination and explanation of function of these two personalities especially in religious and cultural terms; so the main subject of the research is the comparison and assessment of function of al-Da‘ī al-Kabīr with al-Nāṣir al-Kabīr especially from religious perspective and that what effects each one of those two had in religious terms. Following this subject, this assumption is put forward that al-Da‘ī al-Kabīr was a bigoted Zaydī and has made effort in propagating Zaydīyyah Shiism; but al-Nāṣir al-Kabīr, despite belonging to Zaydī denomination, was inclined and close to Imāmiyya fiqh. In this research, the main subject of the research is attended to by descriptive and analytic method. The results of the research indicates that the religious efforts of al-Nāṣir al-Kabīr in Daylam and Tabaristan was one of inclination grounds of Alawis from Zaydī Shiism to Imami Shiism and the inclination of some of al-Nāṣir al-Kabīr students to Imami Shiism is expressive of this matter