The Roman Empress is the consort of the Roman Emperor and is one of the highest examples of nobility in the Empire. Despite this, the Empress typically has little in terms of official power, although they are usually revered by the members of the Empire as "the mother of the nation."
In the modern era, in addition to her ceremonial duties, the Empress typically takes on additional humanitarian or social work to help the Empire and its people. Sometimes, the Empress may take on some of the official duties of the Emperor, although it should be noted that this can only occur with the Emperor's consent.