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Arnulf (alsoArnulph orArnoul) was theillegitimate son of KingLothair of France. He becamearchbishop of Reims.
Arnulf belonged to theCarolingian dynasty, the rule of which in France ended when Arnulf's half-brother,Louis V, died childless.Hugh Capet was elected to succeed him as king.[citation needed] King Hugh made Arnulf archbishop of Reims[1] in March 989, against the will of the previous archbishop,Adalberon, who had wanted to be succeeded byGerbert of Aurillac. In September, Arnulf supported an attempt to place his uncleCharles, Duke of Lower Lorraine, on the French throne. Charles briefly heldRheims andLaon. In 990, Arnulf refused to attend a synod atSenlis and he and Charles were imprisoned on 29 March.[citation needed]
In June 991 Archbishop Seguin of Sens presided over aCouncil of Reims in the Basilica of Saint Basle, which deposed Arnulf for allegedhigh treason, in favour of Gerbert. This deposition was much opposed, however.Pope John XV sent Leo,abbot of Saints Boniface and Alexius atRome, aslegate to preside over a synod atMouzon on 2 June 995. Gerbert was suspended from the episcopum. A second synod, held on 1 July, declared the whole process of deposition and elevation to be illegal and invalid. Thus, Arnulf was reinstated.[citation needed]
Arnulf crownedHugh Magnus, the son of Hugh Capet's successor,Robert II, as co-king in theCapetian tradition in 1017. At this time, any resistance to the new dynasty had died in him. He held the see until his death in 1021, then the only direct male line descendant of the Carolingian family in the eldest living branch aside from his first cousinLouis, who died two years later.
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| Preceded by | Archbishop of Reims 988–991 | Succeeded by |
| Preceded by | Archbishop of Reims 996–1021 | Succeeded by |