Bonn, SS Cassius and Florentius
Founded as a basilica, converted into a stift between 774-788; property of the archbishop of Cologne who used to function as abbot until c. 848; location sometimes simply stated as in 'urbis Bonnae' (RHE 48), sometimes more specifically as in 'villa Basilica' (RHE 54)
Hildigrim
Younger brother of bishop Ludger of Münster, since 802 bishop of Châlons-sur-Marne, also bishop of Halberstadt and director of Werden, died in 827