Ali Shams al-Din II
Ali Shams al-Din was the 18th Tayyibi Isma'ili Dāʿī al-Muṭlaq in Yemen. He succeeded his brother al-Hasan Badr al-Din I in 1418, and held the post until his death in 1428, when he was succeeded by his nephew Idris Imad al-Din.
In 1426, the Zaydi imam of Sana'a, al-Mansur Ali, captured Dhu Marmar after a siege, but allowed the Dāʿī with his family, followers, and possessions to leave the town and move to Haraz, which became the new base of the Tayyibi movement. The Tayyibis also lost a number of other fortresses to the Zaydis at this time, which were later recovered by Idris Imad al-Din.
It was during his tenure that there was a major split into Sunni Bohra led by Jafar bin Khwaja, a native of Patan, Gujarat in Gujarat, India.
