In 370, as Comes rei militaris under the Emperor Valentinian I he fought the Saxons.
[3][4] In 378, under the Emperor Gratian, together with the comes domesticorum Mallobaudes, he defeated the Lentienses, a group of Alamanni, at the Battle of Argentovaria.
[5] It is suggested that at this time he may have been comes utriusque Germaniae, since he was of the same rank as Mallobaudes.
[3] It is also conjectured that he was the magister militum Nanninus who served the Emperor Magnus Maximus, defeated the Franks, and served as guardian of Magnus' son Flavius Victor.
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