After Ali, Power Vacuum in Yemen and The Imam Hadi
The Hamdan tribe remained on the side of Ali, after the defeat of Ali and later his sons. The tribes remained on alliance to Ali but didn't oppose the Ummayas or ally themselves with the other Shias.
At that time Yemen was experiencing a great population movement forming the bulk of the Islamic Expansion mainly settling and Arabizing North Africa/Spain. However, the majority of the Hamdan tribe remained in Yemen which later helped the Hashid/Bakil Hamdani tribes become the biggest local key player, benefiting from the departure of the bulk of the most powerful Nomadic Yemeni tribes of that time into North Africa/Spain in Wetsward movements that continued until the 13th century.
By The 10th century the Imam al-Hadi Yahya bin al-Hussain bin al-Qasim (a scion of Imam al-Hasan, grandson of the Prophet) who, at Sa'da, in 893-7 C.E. arrived to the Northern Highlands on invitation from the Hamdan tribe and from that time till present day the Zaidi moderate Shia teachings became dominant in north Yemen.
Read more about this topic: Hashid
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