Research Notes:

aka Bego.

Depoin suggests that Bego was the son of Gérard Comte de Paris. He appears to assume this on the basis of the hereditary nature of the county of Paris, although it is far from clear that Carolingian counties in France at the time were routinely transmitted to family members by inheritance. Comte. King Charles I authorised “comes...Bego” to dispose of property at Bry [sur-Marne] by charter dated 23 Apr 789, reference to which exists only in a copy made by Baluze.

Marquis de Septimanie. Bego governed the county of Toulouse as "marchio" for Septimania from 806. “Bigo...comes” donated property to “presbitero...Crisogonio” at the monastery of Alaon by charter dated to [806/14]. He was chambrier, equivalent to viceroy, for Louis King of Aquitaine (son of Emperor Charlemagne).

Comte de Paris [815], succeeding comte Stephanus. He founded the abbey of Saint-Maur-des-Fossés near Paris. Emperor Louis I granted immunities to Saint-Maur-des-Fossés at the request of “Bego fidelius noster” and “Begoni...comitis” by two charters dated 20 Jun 816.

The Annales Hildesheimenses record the death of "Bicgo de amici regis" in 815 (which date must be incorrect). The necrology of the abbey of Saint-Germain-des-Prés records the death "V Kal Nov" of "Begoni comitis".

http://fmg.ac/Projects/MedLands/FRANKISH%20NOBILITY.htm#Beggodied816