He was a wealthy nobleman and landowner with vast estates in the region around Vitry-le-Brûle (now Vitry-en-Perthois) near Châlons-sur-Marne.
Theuderic attempted to summon him to court in order to kill him, but after Munderic refused, a force was sent against him.
The Austrasian army, however, lacked siege engines and were unable to invest the place.
Theuderic responded by sending a personal courtier of his, Arigisel, to negotiate for the rebels to come out, which they did.
[1] According to Christian Settipani, Munderic married Arthemia, the granddaughter of Rusticus, archbishop of Lyon, and they were the parents of the wife of the Frankish nobleman, Mummolin,[2] although others have referred to him as Munderic's son.