the state. Ubayd Allah ibn Sulayman ibn Wahb remained vizier from the start of the reign until his death in 901, and was succeeded by his son, al-Qasim, who had from the start been deputizing for his father during the latter's absences from the capital. The freedman Badr, a veteran who had served under al-Muwaffaq and whose daughter married the Caliph's son, remained commander of the army. The fiscal departments, especially of the Sawad, were managed first by the Banu'l-Furat brothers Ahmad and Ali, and after 899 by the Banu'l-Jarrah under Muhammad ibn Dawud and his nephew, Ali ibn Isa. The original administrative team was so effective and harmonious, according to the 11th-century historian Hilal as-Sabi, it was said by subsequent generations that "there had never been such a quartet, Caliph, Vizier, Commander, and chief of the s, as al-Mu'tadid, Ubayd Allah, Badr and Ahmad ibn al-Furat". On the other hand, as Michel Bonner points out, the later reign of al-Mu'tadid "saw a growth of factionalism within this bureaucracy, observable also in the army and in urban civilian life". The intense rivalry between the two bureaucratic dynasties of the Banu'l-Furat and the Banu'l-Jarrah, with their extensive networks of clients, began at this time. Although a strong caliph and vizier could restrain this antagonism, it would dominate the Abbasid government during the following decades, with the factions alternating in office and often fining and torturing their predecessors to extract money according to the well-established practice known as . In addition, al-Qasim ibn Ubayd Allah was of an altogether different character than his father: soon after his appointment to the vizierate, al-Qasim plotted to have al-Mu'tadid assassinated, and tried to involve Badr in his scheming. The general rejected his proposals with indignation, but al-Qasim was saved from discovery and execution by the Caliph's sudden death. The Vizier then tried to dominate al-Muktafi, moved swiftly to have Badr denounced and executed, and was involved in yet more intrigues against the Banu'l-Furat. Return of the capital to Baghdad Al-Mu'tadid also completed the return of the capital from Samarra to Baghdad, which had already served as his father's main base of operations. The city's centre, however, was relocated on the eastern bank of the Tigris and further downstream from the original Round City founded by al-Mansur () a century earlier; it has there remained to this day. As the 10th-century historian al-Mas'udi wrote, the Caliph's