Ulpia Severina, wife of Aurelian (died ?). Most of the information on this woman was derived from coinage and inscriptions, there being no literary sources mentioning her. Ulpia Severina was declared Augusta sometime in or before Autumn 274. There is substantial evidence that she ruled the empire on her own during the interregnum between the death of Aurelian and the election of Tacitus. Some of her coinage appear to have been minted after Aurelian's death. She is the only woman to have ruled the Roman Empire on her own.