Aspects of this topic are discussed in the following places at Britannica.
...and with the aid of the Abencerrajes family seized the Alhambra in 1482 and was recognized as sultan. Abū al-Ḥasan succeeded in recapturing the capital but was deposed by his brother az-Zaghall (Abū ʿAbd Allāh Muḥammad az-Zaghall). On Boabdil’s first military venture (1483) against the Castilians, he was captured and to obtain his release signed the Pact...
...succeeded in recapturing the capital with the assistance of the Zegries family. Muley Hacén was successfully deposed by his brother, the Zagal (Abū ʿAbd Allāh Muḥammad al-Zaghall—the Valiant One), who was supported by the Venegas family.
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