https://www.britannica.com/biography/Theodosius-I
Theodosius I, byname Theodosius the Great, in full Flavius Theodosius, (born January 11, 347, Cauca, Gallaecia [now Coca, Spain]—died January 17, 395, Mediolanum [now Milan, Italy]), Roman emperor of the East (379–392) and then sole emperor of both East and West (392–395), who, in vigorous suppression of paganism and Arianism, established the creed of the Council …