Amminus is the head of the guard standing watch of the Oblivion Gate outside the city's gates. His job is to watch the gate to stop any Daedra who exist while watching for any members of the Knights of the Thorn to return.
Amminus has little respect for the Knights of the Thorn. While he doesn't want to speak ill of them, fearing the worst, feels that they are nothing but a glorified club. Their leader, Farwil Indarys, is the counts son so they have been given the best weapon and armor money can buy. Amminus will go on to say that all the knights had gone into the gate by themselves and have been missing for two days.
When he is off of his shift, he sleeps in the nearby, Knights of the Thorn Headquarters. Once he wakes up he heads back to watch the gate.
- The Elder Scrolls IV: Oblivion (First appearance)