Arwa al-Sulayhi
According to Musta'lī tradition, after the death of al-Amir bi-Ahkam Allah, his infant son, At-Tayyib Abu'l-Qasim, about two years old, was protected by Arwa al-Sulayhi who died in 1138, wife of the chief Fatimid Da'i of Yemen. She had been promoted to the post of Hujjat al-Islam long before by al-Mustansir Billah when her husband died and ran the Fatimid dawah from Yemen in the name of Imam At-Tayyib Abu'l-Qasim. During her leadership At-Tayyib Abu'l-Qasim went into occultation so she instituted the office of Da'i al-Mutlaq. Zoeb bin Moosa was first to be instituted to this office and the line of Tayyibi Da'is that began in 1132 has passed from one Da'i to another up to the present day. Arwa al-Sulayhi was the Hujjah in Yemen from the time of Imam Al-Mustansir Billah. She appointed the Da'i in Yemen to run religious affairs. Isma'ili missionaries Ahmed and Abdullah (in about 1067 AD (460 AH)) were also sent to India in that time. They sent Syedi Nuruddin to Dongaon to look after southern part and Syedi Fakhruddin to East Rajasthan, India.