Yahya al-Qadir

But Yaḥyā al-Qādir (reigned 1075–92), al-Maʾmūn’s grandson, soon lost both Valencia and Córdoba. An alliance with Alfonso VI hastened the end of the Dhū an-Nūnid kingdom: while al-Qādir was briefly restored to Toledo, he bargained away his capital to the Christians in return for Valencia (1085),…

The weakness of al-Qādir, al-Maʾmun’s successor, permitted the Valencians to reassert their independence under the leadership of the Toledan governor, Abū Bakr, who allied himself with Alfonso VI of Leon and Castile. But when the latter took Toledo in 1085, he installed al-Qādir as puppet ruler in Valencia…

…his influence in Toledo when Yahya al-Qadir succeeded his father as caliph (Muslim head of state) and expelled Alfonso’s sympathizers.