In 908, al-Muktafi fell ill, and was evidently nearing his end.
The issue of succession had been left open, and with the Caliph incapacitated, the vizier al-Abbas ibn al-Hasan al-Jarjara'i took it upon himself to seek out a successor.
Two different versions are told of the events: Miskawayh reports that the vizier sought the advice of the most important bureaucrats (kuttāb, sing.
kātib), with Mahmud ibn Dawud ibn al-Jarrah suggesting the older and experienced Abdallah ibn al-Mu'tazz, but Ali ibn al-Furat—who is usually portrayed as a villain by Miskawayh—proposing instead the thirteen-year-old Ja'far al-Muqtadir as someone weak, pliable, and easily manipulated by the senior officials.
The vizier also consulted Ali ibn Isa al-Jarrah, who refused to choose, and Muhammad ibn Abdun, whose opinion has not been recorded.
In the end, the vizier concurred with Ibn al-Furat, and on al-Muktafi's death Ja'far was proclaimed as heir and brought to the caliphal palace; when the testament of al-Muktafi was opened, he too had chosen his brother as his successor.
A different story is reported by the Andalusi historian Arib, whereby the vizier dithered between the candidacies of Ibn al-Mu'tazz and another older Abbasid prince, Muhammad ibn al-Mu'tamid.
The choice of the latter would represent a major political departure, in effect a repudiation of al-Mu'tadid's coup that had deprived the offspring of al-Mu'tamid of power, and of the officials and ghilmān that had underpinned al-Mu'tadid's regime.
The vizier indeed inclined towards Muhammad, but the latter prudently chose to await al-Muktafi's death before accepting.
Indeed, the Caliph recovered, and was informed that people were discussing both Ibn al-Mu'tazz and Ibn al-Mu'tamid as his possible successors.
This worried al-Muktafi, who in the presence of the qāḍīs as witnesses officially nominated Ja'far as his heir, before dying.
The two stories highlight different aspects of al-Muqtadir's accession: on the one hand, a cabal of officials choosing a weak and pliable ruler, "a sinister development" that inaugurated one "of the most disastrous reigns in the whole of Abbasid history [...] a quarter of a century in which all of the work of [al-Muqtadir's] predecessors would be undone", while on the other hand, the issue of dynastic succession, and especially the loyalty of al-Mu'tadid's ghilmān to his family, evidently also played an important role.

Al-Muqtadir's succession was unopposed, and proceeded with the customary ceremonies.
The full treasury bequeathed by al-Mu'tadid and al-Muktafi meant that the donatives to the troops could easily be paid, as well as reviving the old practice of gifts to the members of the Hashimite families.
The new caliph was also able to display his largess, and solicitude for his subjects, when he ordered the demolition of a suq erected by his predecessor near Bab al-Taq, where the merchants were forced to pay rent, instead of being able to offer their wares freely as before.
This benefited the poor of the capital.
Nevertheless, the intrigues surrounding his accession had not abated.
The supporters of Ibn al-Mu'tazz in particular remained determined to get their candidate on the throne.
According to Arib, the vizier al-Abbas had been one of the chief conspirators, but had begun to acquiesce to al-Muqtadir's rule, hoping to control him.
His increasingly arrogant behaviour spurred the other conspirators on, and on 16 December 908, the Hamdanid commander al-Husayn ibn Hamdan led a group of men that killed the vizier as he was riding to his garden.
The conspirators then sought to seize the young caliph as well, but the latter had managed to flee to the Hasani Palace, where he barricaded himself with his supporters.
The ḥājib (chamberlain) Sawsan was the driving force behind the loyalists' resistance, urging the commanders Safi al-Hurami, Mu'nis al-Khadim, and Mu'nis al-Khazin, to defend the caliph.
Al-Husayn tried the entire morning to gain entrance, but failed; and then abruptly, and without notifying his fellow conspirators, fled the city to his home of Mosul.
In
In 908, al-Muktafi fell ill, and was evidently nearing his end. The issue of succession had been left open, and with the Caliph incapacitated, the vizier al-Abbas ibn al-Hasan al-Jarjara'i took it upon himself to seek out a successor. Two different versions are told of the events: Miskawayh reports that the vizier sought the advice of the most important bureaucrats (kuttāb, sing. kātib), with Mahmud ibn Dawud ibn al-Jarrah suggesting the older and experienced Abdallah ibn al-Mu'tazz, but Ali ibn al-Furat—who is usually portrayed as a villain by Miskawayh—proposing instead the thirteen-year-old Ja'far al-Muqtadir as someone weak, pliable, and easily manipulated by the senior officials. The vizier also consulted Ali ibn Isa al-Jarrah, who refused to choose, and Muhammad ibn Abdun, whose opinion has not been recorded. In the end, the vizier concurred with Ibn al-Furat, and on al-Muktafi's death Ja'far was proclaimed as heir and brought to the caliphal palace; when the testament of al-Muktafi was opened, he too had chosen his brother as his successor. A different story is reported by the Andalusi historian Arib, whereby the vizier dithered between the candidacies of Ibn al-Mu'tazz and another older Abbasid prince, Muhammad ibn al-Mu'tamid. The choice of the latter would represent a major political departure, in effect a repudiation of al-Mu'tadid's coup that had deprived the offspring of al-Mu'tamid of power, and of the officials and ghilmān that had underpinned al-Mu'tadid's regime. The vizier indeed inclined towards Muhammad, but the latter prudently chose to await al-Muktafi's death before accepting. Indeed, the Caliph recovered, and was informed that people were discussing both Ibn al-Mu'tazz and Ibn al-Mu'tamid as his possible successors. This worried al-Muktafi, who in the presence of the qāḍīs as witnesses officially nominated Ja'far as his heir, before dying. The two stories highlight different aspects of al-Muqtadir's accession: on the one hand, a cabal of officials choosing a weak and pliable ruler, "a sinister development" that inaugurated one "of the most disastrous reigns in the whole of Abbasid history [...] a quarter of a century in which all of the work of [al-Muqtadir's] predecessors would be undone", while on the other hand, the issue of dynastic succession, and especially the loyalty of al-Mu'tadid's ghilmān to his family, evidently also played an important role.
Al-Muqtadir's succession was unopposed, and proceeded with the customary ceremonies. The full treasury bequeathed by al-Mu'tadid and al-Muktafi meant that the donatives to the troops could easily be paid, as well as reviving the old practice of gifts to the members of the Hashimite families. The new caliph was also able to display his largess, and solicitude for his subjects, when he ordered the demolition of a suq erected by his predecessor near Bab al-Taq, where the merchants were forced to pay rent, instead of being able to offer their wares freely as before. This benefited the poor of the capital. Nevertheless, the intrigues surrounding his accession had not abated. The supporters of Ibn al-Mu'tazz in particular remained determined to get their candidate on the throne. According to Arib, the vizier al-Abbas had been one of the chief conspirators, but had begun to acquiesce to al-Muqtadir's rule, hoping to control him. His increasingly arrogant behaviour spurred the other conspirators on, and on 16 December 908, the Hamdanid commander al-Husayn ibn Hamdan led a group of men that killed the vizier as he was riding to his garden. The conspirators then sought to seize the young caliph as well, but the latter had managed to flee to the Hasani Palace, where he barricaded himself with his supporters. The ḥājib (chamberlain) Sawsan was the driving force behind the loyalists' resistance, urging the commanders Safi al-Hurami, Mu'nis al-Khadim, and Mu'nis al-Khazin, to defend the caliph. Al-Husayn tried the entire morning to gain entrance, but failed; and then abruptly, and without notifying his fellow conspirators, fled the city to his home of Mosul. In
Al-Muqtadir