In 993, a-Qasim proclaimed the imamate in Tihamah, but his movement was defeated in the next year by the governor of Mecca.
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Al-Qasim invaded Yemen in 997 or 998 and appropriated Sa'dah, the traditional capital of the Zaydiyyah domain.
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The governor in Dhamar, az-Zaidi, rebelled and captured the imam's son Ja'far.
Abd al-Karim Qasim | Mir Qasim | Mansur Ali Khan | Ahmad al-Mansur | Port Qasim | Muhammad bin Qasim | Mallikarjun Mansur | al-Mansur Muhammad | Ali Mansur | Abu al-Qasim al-Zahrawi | Syed Zahoor Qasim | Qasim Khanate | Qasim I of Astrakhan | Qasim II of Astrakhan | Qasim Ibrahim | Qasim fort | Qasim Abid Muhammad Hammadi al-Fahadawi | Muhammad Bin Qasim | Bin Qasim Town | Bin Qasim | At-Tayyib Abu'l-Qasim |
It survived long after his death in Mayyafariqin, where Ibn Shaddad reported it as still extant two centuries later.
The famous physician, scientist, and surgeon Abu al-Qasim al-Zahrawi (Abulcasis) was also active in Al-Hakam's court during his reign.
Al-Mansur al-Hasan had to stay for much of his time in Sa'dah, the traditional stronghold of the imams in the far north.
However, al-Mansur al-Husayn defeated his opponent at As Sudah.
In 1738 a serious crisis occurred in the relations between the Zaidi government and the French traders in Mocha.
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Al-Mansur al-Husayn II was also opposed by his brother Ahmad, who governed Ta'izz and kept the revenues for himself.
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He was opposed by another claimant, an-Nasir Muhammad, who was supported by the Hashid and Bakil, and by the lord of Kawkaban.
These delivered him into the hands of the newly proclaimed imam al-Mansur al-Husayn III who was based at at-Tawilah west of Kawkaban.
Infighting among the Turkish administrators in 1613 left the north of the country exposed to the forces of the imam, and the important city Sa'dah fell in 1617.
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Then, however, the emir of the important stronghold Hajjah in the western mountains chose to support al-Qasim.
In particular, he was known for his intensely negative views of Ibn Arabi, Hallaj, Ibn al-Farid, Ibn Sab'in and Shushtari, some of the primary figures in Sufism.
Abu al-Qasim al-Zahrawi (born in Córdoba, Spain; 936-1013), also called Abulcasis, wrote Al-Tasrif (The Method of Medicine), a 30-part medical encyclopedia in Arabic.
Ali bin Ali Douha and two other militants were reported to have been killed during the raid.
The anonymous Dutch translator, "S.D.B.", gave a concise biographical review of the philosophers related to the text: Al Farabi, Avicenna, Al Ghazali, Ibn Bajjah, Ibn Rushd, Junayd, and Mansur Al-Hallaj (with a description of his death and a reference to his famous "Ana al-Haqq").