Al-Mansur al-Husayn II  Al-Mansur al-Husayn II (14 June 1696 - 6 March 1748) was an Imam of Yemen who ruled in 1727-1748. He belonged to the Qasimid family which claimed descent from Muhammad, who dominated the Zaidi imamate of Yemen in 1597-1962. Al-Husayn bin al-Qasim was a son of Imam al-Mutawakkil al-Qasim. At the end of his father's reign, he entertained contacts with the rebellious tribesmen of Hashid and Bakil. However, the rebellion died down and there seem to have been no further consequences for his illoyal conduct. When al-Mutawakkil al-Qasim died some months later, in 1727, al-Husayn went to San'a where, after his father's funeral, he laid claim to the imamate and took the title al-Mansur al-Husayn. He was opposed by another claimant, an-Nasir Muhammad, who was supported by the Hashid and Bakil, and by the lord of Kawkaban. Al-Mansur al-Husayn II retained control over San'a but found reason to pay allegiance to an-Nasir Muhammad. Somewhat later, new trouble flared up. Al-Mansur al-Husayn II was successful in routing his opponent's forces and captured the latter's sons. In about 1729 an-Nasir Muhammad appeared at the court of al-Mansur al-Husayn and submitted. That left the Zaidi state in the hands of al-Mansur al-Husayn II. These days witnessed economic changes detrimental to the power of the Zaidi state. Coffee had hitherto been almost solely produced in Yemen, and the rising prices provided great incomes for the country. However, in 1723 coffee began to be imported to Europe from Java, and in the 1740s from the West Indies. The losses of revenue were accompanied by loss of territory. In 1731 the imam's agents in the Aden area were murdered by a chief in Lahej, Fadl bin Ali al-Abdali. When al-Mansur al-Husayn II sent tribesmen to deal with al-Abdali, he took refuge in Yafa. There he persuaded the local sultan to help him driving the imam's forces from Aden and Lahej.