The two Epirote provinces became part of the Diocese of Moesia, until it was divided in ca. 369 into the dioceses of Macedonia and Dacia, when they became part of the former. In the 4th century, Epirus was still a stronghold of paganism, and was aided by Emperor Julian (r. 361–363) and his praetorian prefect Claudius Mamertinus through reduction in taxes and the rebuilding of the provincial capital, Nicopolis. According to Jordanes, in 380 the Visigoths raided the area. With the division of the Empire on the death of Theodosius I in 395, Epirus became part of the Eastern Roman or Byzantine Empire. In 395–397, the Visigoths under Alaric plundered Greece. They remained in Epirus for a few years, until 401, and again in 406–407, during Alaric's alliance with the Western Roman generalissimo Stilicho in order to wrest the Eastern Illyricum from the Eastern Empire.