- Main article: Imperial Legion
The Fifteenth Legion was one of the Imperial Legions known to have existed on Tamriel. The Fifteenth Legion was involved with the defending of Orsinium, along with the Seventh Legion. Orsinium was invaded during the Fourth Era by the Bretons of High Rock, and the Redguards of Hammerfell. The two Legions escorted the survivors of Orsinium to the safety of Skyrim.