[1] Regino of Prüm in his famous Chronicon writes, inaccurately for the year 837, that: Murmanus rex Brittonum moritur et Numenoio apud Ingelheim ab imperator ducatus ipsius gentis traditur.

[3] Nominoe's power base was in the Vannetais and two charters refer to him as Count of Vannes, though it is unknown when that title was held, be it as early as 819 or as late as 834.

Nominoe may not have possessed any land outside Vannes and his ability to gather revenue in Breton-speaking territories was probably no greater than any other aristocrat of those regions.

It is clear from the wording of the account of this event in Nithard that Nominoe was too powerful to be compelled to submit; later in 841 he rebuffed the overtures of the new emperor, Lothair I, who claimed Neustria.

[6] Nominoe remained loyal to Charles throughout the next year, even making a donation "in alms for the king" to the abbey of Redon on 25 January 842.

[8] Nominoe was thereafter a constant enemy of Charles and his authority in Neustria, often acting in concert with Lothair, Lambert, and Pepin II of Aquitaine.

Breton troops fought under Lambert in Neustria and when, in June 844, Charles was besieging Toulouse, Nominoe raided into Maine and plundered the territory.

However, some Bretons had connived against him with Charles and the king tried to enter Brittany in support of the defectors, but without success: he was defeated at the Battle of Ballon just north of Redon across the Vilaine on 22 November 845.

[10] It is probable that in the Vannetais Nominoe's authority had been weakened after his split with Charles in 843 and Lupus of Ferrières reports "unrest" in Brittany during this period.

[14] In 849 at a place called Coitlouh, Nominoe held a synod whereat he deposed the five Breton bishops of Alet, Saint-Pol, Vannes, Quimper, and Dol.

The later popes Benedict II and Nicholas I believed that Nominoe had forced the bishops to admit to crimes they had not committed and that their depositions were thus invalid.

A Frankish synod of 850 held at either Angers or Tours accused Nominoe of simony by unlawfully removing bishops and replacing them with mercenarii (mercenaries of his own).