We have two letters of king Theodoric the Great concerning Eustorgius: the first, addressed to the count and senator Adilas, urges Eustorgius to take under his protection the estates owned by the Church of Milan in Sicily, and the second, directly addressed to Eustorgius, asks the bishop to restore the bishop of Aosta who had been unjustly accused by some clergy of treason. Eustorgius was also asked to judge the slanderers.
In an own letter, Avitus of Vienne (died 518) thanks Eustorgius for the financial support given in order to free some Italian prisoners who were captured by the ArianBurgundians.
Eustorgius died on 6 June 518. His remains were interred in the chapel of Saint Sixtus aside the city’s basilica of St. Lorenzo Maggiore. His feast is celebrated on June 6 in such basilica and together all the saint bishops of Milan on 25 September.