Arwa al-Sulayhi
Upon the death of the twentieth Imam, al-Amir bi-Ahkami'l-Lah (d. ), his two-year-old child at-Tayyib Abu'l-Qasim (b. ) was appointed twenty-first Imam. The supporters of Tayyeb became the Tayyibi Ismāʿīlī. As Tayyeb was not in position to run the dawah, Queen Arwa al-Sulayhi, the Da'i al-Mutlaq, acted as his regent. Imam Tayyeb was hidden, and the second phase of seclusion started. The Da'i had now been given absolute authority and made independent from political activity. With the period of time the Tayyibi divided further into several sects headed by different Dais. These Da'i al-Mutlaq continued acting on behalf of the hidden Tayyibi Ismāʿīlī Imams till date. Dawoodi Bohra is the biggest sub-sect amongst the Tayyibi Ismāʿīlī with a population spread over many countries.