He was appointed by Nanthild, the queen mother, who gave him her niece, Ragnobert, in marriage.
She called together the chief magnates and bishops of the kingdom at Orléans and he was acclaimed mayor.
The Burgundian patrician Willibad had a long-running feud with Flaochad when the latter was appointed mayor.
Finally Flaochad convinced Clovis II to hold a court near Autun and summon Willibad.
According to Fredegar, who seems to have been personally interested in this event, the last which he recorded, both were the victims of divine judgement, for they had sworn friendship in holy places and had subsequently despoiled land to enrich themselves and made war on each other.