» For the U.S. area code, see Area code 425. Events By Place Western Roman Empire October 23 — Valentinian III becomes Western Roman Emperor. Aëtius leads an army into Italy to support the self-proclaimed emperor Joannes. Eastern Roman Empire The Sanhedrin is disbanded by the Roman Empire. By Topic Arts and Sciences Last known usage of Demotic. Religion Buddhism begins to spread to Southeast Asia. Births Zu Chongzhi, Chinese mathematician Deaths October 10 — A… (More on 425)