Why was Gerbert of Aurillac accused of collaborating with Duke Charles of Lorraine?

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Sylvester II Sylvester II, detail from the ivory vessel used at the consecration of Otto III, 996; in the Domschatzkammer des Aachener Domes, Aachen, Ger.

Gerbert of Aurillac (later Pope Sylvester II) was not actually a collaborator with Duke Charles of Lorraine. Following the betrayal of Reims by Archbishop Arnulf to his uncle, Duke Charles, Gerbert was forced to remain in the city for eight months. After he eventually escaped to the court of King Hugh Capet, he was falsely accused of having been the leader in "enormous crimes" of collaboration with the Duke.1