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Abu'l-Abbas Muhammad ibn Ja'far al-Muqtadir (Arabic: أبو العباس أحمد (محمد) بن جعفر المقتدر, romanized: Abū al-ʿAbbās Aḥmad (Muḥammad) ibn al-Muqtadir; 1 January 909 – 23 December 940), usually simply known by his regnal nameal-Radi bi'llah (Arabic: الراضي بالله, romanized: al-Rāḍī bi'llāh, lit.'Content with God'[4]), was the twentieth Caliph of the Abbasid Caliphate, reigning from 934 to his death. He died on 23 December 940 at the age of 31. His reign marked the end of the caliph's political power and the rise of military strongmen, who competed for the title of amir al-umara.
The future al-Radi was born on 20 December 909, to the caliph al-Muqtadir (r.908–932) and a Greek-born slave concubine named Zalum.[5][6] At the age of four, he received the nominal governorship of Egypt and the Maghreb, and was sent with the commander-in-chief Mu'nis al-Muzaffar to Egypt, who became his tutor.[6]
When Mu'nis and al-Muqtadir fell out in 927, Abu'l-Abbas and the vizierIbn Muqla tried to mediate between his father and the powerful commander-in-chief, but to no avail.[6] In 930, Abu'l-Abbas received the governorship over Syria from his father, although he remained in Baghdad, residing in his palace in the Muharrim quarter of the city.[6] In the next year, rumours circulated that Mu'nis intended to abduct Abu'l-Abbas, take him to Syria, and declare him caliph there. This alarmed al-Muqtadir, who had his son brought to reside with him in the caliphal palace.[6]
When his father was killed in 932, Abu'l-Abbas was proposed as a successor, but eventually his uncle al-Qahir (r.932–934) was chosen.[5][6] Abu'l-Abbas was imprisoned as a dangerous rival, and his properties confiscated. He remained confined until the deposition of al-Qahir, when he was freed and raised to the throne (24 April 934).[5][6][7]
The contemporary historian al-Masudi describes him as pleasing in appearance, using scents in large amounts, and of a generous nature, being notable for the lavish gifts he gave his courtiers. According to al-Masudi, the caliph "enjoyed talking of the men and things of the past and sought out scholars and men of letters and frequently summoned them to his presence and lavished marks of his liberality upon them".[8] Unlike the forceful al-Qahir, he quickly became a figurehead ruler, while ambitious men seized authority in the state.[5]
After the distinguished former vizierAli ibn Isa al-Jarrah declined to be reappointed to the office on account of his advanced age, Ibn Muqla, who had led the conspiracy against al-Qahir, received the post.[5][7] However, for the first months of the reign, Muhammad ibn Yaqut continued to be the most powerful member of the court until his downfall in April 935; only then did Ibn Muqla truly gain control of the administration.[5] In 935, the government was forced to take measures to confront the turmoil in Baghdad because of the behaviour of some Hanbali fanatics. Supported by popular sentiment, they accosted people in the streets, forced their way into private dwellings, emptied vessels of wine wherever found, broke musical instruments and mistreated female singers, pried into the details of trade, beat up their Ash'ari rivals, and generally acted in an arbitrary manner against anyone who transgressed against their strict interpretation of Islamic law and custom.[5]
By this time, the greatest threat faced by the Caliphate was the increasing independence of the regional governors, who had taken advantage of the internal quarrels in the Abbasid court to strengthen their own control over their provinces and withheld the taxes due to Baghdad, leaving the central government crippled.[7] Ibn Muqla resolved to reassert his control over the neighbouring provinces by military force, and chose the Hamdanid-controlled Jazira as his first target: in 935 he launched a campaign that took the Hamdanid capital, Mosul, but he was forced to return to Baghdad. Another attempt in 936 to launch a campaign against the rebellious governor of Wasit, Muhammad ibn Ra'iq, failed to even get started. Coupled with his failure to counter the mounting financial crisis, this last disaster led to Ibn Muqla's downfall.[9] In April 936, Ibn Muqla was arrested by Muhammad ibn Yaqut's brother, al-Muzaffar, who forced al-Radi to dismiss him as vizier.[5]
Ibn Muqla's dismissal marked the end of the independence of the Abbasid caliphs, for, shortly thereafter, al-Radi appointed Ibn Ra'iq to the new post of amir al-umara ("commander of commanders"), a military office that became the de facto ruler of what remained of the Caliphate. The caliph retained only control of Baghdad and its immediate environs, while all government affairs passed into the hands of Ibn Ra'iq and his secretary.[5][10] The name of the amir al-umara was even commemorated in the khutba of the Friday prayer, alongside that of the caliph.[5]
Al-Radi is commonly spoken of as the last of the real Caliphs: the last to deliver orations at the Friday service, to hold assemblies with philosophers to discuss the questions of the day, or to take counsel on the affairs of State; the last to distribute largess among the needy, or to interpose to temper the severity of cruel officers.
故郷を離れると、変化が始まっていた。豊かな東方、ベルベル人のアフリカ、エジプト、そしてシリアとメソポタミアの大部分は消え去り、モスルは独立し、アラビア半島はカルマティア人と現地の首長によって支配され、バスラとワシトでさえ反乱を起こした。「ギリシャ人」（ビザンツ帝国）の進軍を食い止めたのは、勇敢なハムダニ朝の王子であり、彼は「国民の剣」という称号にふさわしい人物であった。