[4] In 755 a mayor Wulfoald, probably a relative of the founder of the abbey, was accused of high treason and plotting against Pepin the Short, was condemned to death.
When Fulrad intervened to save his life, Wulfoald expressed his gratitude by giving King Childéric II his possessions, including the Abbey.
Some time between 816 and 826 Smaragdus obtained royal protection for the abbey from Louis the Pious, ensuring that wagons, pack-horses and ships would be exempt from customs taxes on goods transported between the monastery and its lands.
During the Middle Ages, the Abbey was famous for its relics, not least of which concerned Saint Anatole, Bishop of Cahors, whose body was reputed to have been transferred to Mihiel in 779.
The most famous of these is a 9th-century manuscript on the Holy Trinity by Pseudo-Athanasius, which was stolen during World War one, but discovered in a Hamburg bookshop in 2007 and reintegrated into the collection.