Concilium Germanicum

The Concilium Germanicum was the first major Church synod to be held in the eastern parts of the Frankish kingdoms. It was called by Carloman on 21 April 742/743 at an unknown location, and presided over by Boniface, who was solidified in his position as leader of the Austrasian church. German historian Gunther Wolf judges that the Concilium was the high point in Boniface's long career.

Much of the documentation pertaining to the Concilium relies on Boniface and documents associated with his life, and while the saint was prone to rhetorical embellishment and exaggeration in his correspondence, his assessment of the situation in the Frankish church appears to be reliable, although in some details he was off by a few years—the last synod in the Frankish church appears to have been held in 695 in Auxerre. He outlines three main problems in a letter written early in 742 to the newly elected Pope Zachary:

Boniface had begun his reform attempts of the Frankish church in the 730s, and by the 740s had found a kindred spirit in Carloman, the more religiously oriented of Charles Martel's two sons who divided their father's domain. When Carloman promised Boniface a synod, he saw an opportunity to address two of his main interests in his reform efforts: to protect church property from a rapacious gentry, and to impose stricter guidelines on the clergy.

Participation in the Concilium was restricted to Boniface's supporters, and among those invited were the bishops of Carloman's Austrasia. As well as Boniface (who, as archbishop, presided over the synod) the bishops of Cologne, Strasbourg, and Büraburg were present, as was a chorbishop named Willibald and a bishop named Dadan (who was possibly from Erfurt or an auxiliary bishop from Utrecht). Absent were the bishops from Utrecht, Metz, Verdun, Speyer, and Liège. Boniface's main opponents, Milo, bishop of Reims, and Gewilip, bishop of Mainz, failed to appear.

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