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.
[3] 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.
[6] Strengthened by the absence of his enemies,[6] Boniface succeeded in having stricter guidelines adopted, but the effort to re-appropriate church property was thwarted by bishops and nobility alike.
Theodor Schieffer (in his 1954 biography of the saint) maintained 743,[14] pace Heinz Löwe,[15] as do Kurt-Ulrich Jäschke[16] and Alain Dierkens.