Al-Ḥasan ibn Zayd ibn Muḥammad ibn Ismā‘il ibn al-Ḥasan ibn Zayd (; died 6 January 884), also known as al-Da‘ī al-kabīr (, "the Great/Elder Missionary"), was an Alid who became the founder of the Zaydid dynasty of Tabaristan.
Al-Ḥasan ibn Zayd ibn Muḥammad ibn Ismā‘il ibn al-Ḥasan ibn Zayd (; died 6 January 884), also known as al-Da‘ī al-kabīr (, "the Great/Elder Missionary"), was an Alid who became the founder of the Zaydid dynasty of Tabaristan.
