Al-Hasan bin Ahmad was the third of the six sons of imam an-Nasir Ahmad. An-Nasir Ahmad had been a powerful ruler who had consolidated Zaydiyyah influence in the Yemeni highland, but after his death in 934 the imamate entered into a rather uncertain period. The rival Yu'firid Dynasty controlled Sa'dah, the residence of the Rassids, for four months after an-Nasir's demise. Then al-Hasan claimed the imamate, with the regnal name al-Muntakhab al-Hasan. However, his elder brother al-Mukhtar al-Qasim was set up as a rival imam. Neither al-Mutakhab al-Hasan nor al-Mukhtar al-Qasim are listed in the later Zaidi chronicles, which count the imamate of their younger brother al-Mansur Yahya as starting from 934. The death of al-Muntakhab al-Hasan is dated in 936 by the historian Ibn Khaldun; another text says 939. The next important Rassid figure was his brother al-Mukhtar al-Qasim.
- Enzyklopädie des Islam, Vol. III, Leiden 1936, p. 1216.
- Cesare Ansaldi, Il Yemen nella storia e nella leggenda. Roma 1933, p. 130.
- H.C. Kay, Yaman; Its Early Medieval History. London 1892, p. 186.