It is interesting to note that Gregory apparently learned of the presbyterial status of Leuparicus from Brunhild's letter, not from Leuparicus' bishop, Palladius of Saintes. It seems that Leuparicus was in direct service of the queen rather than his bishop (there is no mention of any letters Palladius himself wrote to Gregory, see [2313]).
Brunhild was at that time at the hight of her political power, acting as a regent to both her sons: Theudebert II, who ruled over Austrasia, and Theuderic II, king of Burgundy (see Wood 1994: 130).