He sent word to Istanbul of the change in office, but before the customary proclamation and khil'ah (robe of honor) arrived from the capital he was deposed by the ruler of Egypt, Ali Bey al-Kabir, who replaced him with Abd Allah ibn Husayn of the rival Barakat clan.
Abd Allah entered Mecca with a forged firman on Friday, 18 Rabi al-Awwal 1184 AH (13 July 1770) supported by Egyptian troops led by Muhammad Bey Abu al-Dhahab, and was installed as Emir on the same day.
In early October Ahmad resumed the Emirate after defeating Abd Allah's forces with the support of Bedouin allies.
[2][3][4] On 6 February 1773 Ahmad was unseated by his nephew Surur ibn Musa'id, who proclaimed himself Emir of Mecca.
[5][6] In the following years there occurred 15 clashes between the two factions, culminating in a final engagement in Jumada al-Thani 1193 AH (June/July 1779) when Ahmad was captured.