For the area code, see Area code 450. Events By Place Eastern Roman Empire August 25 — Marcian's proclaimed Emperor by Aspar and Pulcheria. Europe Angles, Saxons and Jutes invade Britain (traditional date), marking the beginning of the usage period of Old English. Dome of Baptistry of Neon, Ravenna, Italy,'s started to be remodeled (approximate date). Births Thrasamund, king of the Vandals Zu Geng Deaths 28 July — Theodosius II, East Roman Emperor (after falling from his… (More on 450)