When Columbanus, the founder of Luxeuil, was banished from the Kingdom of Burgundy, on account of his reproving the morals of King Theuderic II, he recommended his community choose Eustace as his successor.
[2] After the death of Theuderic, Clothaire II sent Eustace to Bobbio to ask Columbanus to return, but the exiled abbot declined.
Through the royal patronage, its benefices and lands were increased, King Clotaire II devoting a yearly sum, from his own revenues, towards its support.
Eustace and his monks devoted themselves to preaching in remote districts, not yet evangelized, chiefly in the north-eastern extremities of Gaul.
[2] During his abbacy, the monastery contained about 600 monks and produced both bishops and saints, including Acarius, Amatus, Audomar, and Romaric.