Al-Mansur an-Nasir (died 1462) was an imam of the Zaidi state in Yemen who held power in parts of the northern Yemeni highland in 1436–1462.
[2] At this time, the once powerful Rasulid Dynasty in lowland Yemen was quickly crumbling, and fell altogether in 1454.
The new Sunni lowland regime was the Tahiride Dynasty, which was engaged in warfare with the imam from its inception.
Nevertheless, it was internal Zaidi dissention that finally toppled the position of al-Mansur an-Nasir.
The important city San'a was eventually acquired by his rival al-Mutawakkil al-Mutahhar, later to be conquered by the Tahirides in 1462.