Before he could pass the river with safety it was necessary to subdue certain fortresses, one of which was for several days vigorously defended by the governor, Yussuf Kothual, a Kharizmian.
Yussuf, in desperation, drew his dagger and rushed upon the sultan.
Abd-ul-Aziz is said to have yielded the more readily as being desirous of bringing about a similar alteration in the succession in Turkey, in favour of his own eldest son, Prince Yussuf Izz-ed-din; public opinion was, however, opposed to so sweeping a change, and the succession to the throne in Turkey still goes to the eldest surviving member of the house of Osman.
His colleague, Yussuf Pasha, in East Hellas fared no better; here, too, the Turks gained some initial successes, but in the end the harassing tactics of Kolokotrones and his guerilla bands forced them back into the plain of the Kephissos.
Alp Arslan afterwards undertook an expedition against Turkestan, and met with his death at the hands of a captured chief, Barzami Yussuf (Yussuf Kothnal), whom he had intended to shoot with his own hand.
The name appears to have been derived from the Yussuf ben-Serragh, the head of the tribe in the time of Mahommed VII., who did that sovereign good service in his struggles to retain the crown of which he was three times deprived.
It is, however, only fair to add that the sultan was doubtless influenced by the desire to bring about a similar change in the succession to the Ottoman throne and to ensure the succession after him of his eldest son, Yussuf Izz-ed-din.
Six children survived him: Prince Yussuf Izz-ed-din, born 1857; Princess Saliha, wife of Kurd Ismail Pasha; Princess Nazime, wife of Khalid Pasha; Prince Abd-ul-Mejid, born 1869; Prince Seif-ed-din, born 1876; Princess Emine, wife of Mahommed Bey; Prince Shefket, born 1872, died 1899.
He served as a captain in Algeria under Marshal Bugeaud, who, in recognition of his gallantry in the battles of Sidi Yussuf and Isly, made him his aide-de-camp and entrusted him with important commissions.
On the 12th of June he abandoned the town upon orders from Commodore Rodgers, for Lear had made peace (4th June) with Yussuf, the de facto Pasha of Tripoli.