After his departure from Egypt, he assumed control of the remaining Ikhshidid domains in southern Syria and Palestine until defeated and captured by the Fatimids in March 970.
[5][6] During this contest, he is reported to have written to the Fatimid caliph, al-Mu'izz li-Din Allah, urging him to invade Egypt and restore order in the country,[6] which since the death of Kafur was plagued by factional rivalries that had paralyzed its administration.
From Farama he followed the Nile down to Rawda Island, and made his ceremonial entry into the capital, Fustat, on Friday, 28 November 968, accompanied by the vizier Ibn al-Furat.
In the ensuing Friday prayer, his name was mentioned immediately after that of the underage emir, Abu'l-Fawaris Ahmad, in the khuṭba, thus effectively marking Hasan as regent or even co-ruler.
[12] Taking up residence in the palace, Hasan moved to consolidate his authority: three days later he imprisoned Ibn al-Furat and a number of the latter's associates, forcing them to pay exorbitant fines.
[10][13] Fustat was left in a complete power vacuum: Ibn al-Furat, who had been set free before al-Hasan's departure, formally resumed his duties, but lacked any support among the remaining notables, who, on the other hand, were unable to put forward any candidate to replace him.
[16] The situation in Palestine had deteriorated in his absence, as the Qarmatians once more threatened Ikhshidid rule,[17] while further north, the collapse of Hamdanid power in northern Syria exposed the entire region to the Byzantines, who laid siege to Antioch, capturing the city in October 969.