Gerard of Florennes dating history

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Gerard of Florennes (ca 975, bishop 1012 – 14 March 1051), bishop of Cambrai as Gerard I, had formerly been chaplain to Henry II, Holy Roman Emperor, and helpful to the latter in his political negotiations with Robert the Pious, King of France. In 1024 Gerard called a synod in Arras to confront a purported heresy fomented by the Gundulfian heretics, who denied the efficacy of the Eucharist. The records of this synod, the Acta Synodi Atrebatensis, preserve a summary of orthodox Christian doctrine of the early eleventh century, as well contemporary peace-making practices. According to this text's author, the heretics were convinced by Gerard's explanation of orthodoxy, renounced their heresy, and were reconciled with the church.