For the area code, see Area code 408. 400s | dn1=410s | dn2=420s | dn3=430s }} Events By Place Western Roman Empire In the summer of this year, the usurper Constantine III captures Hispania, destroying the loyalist forces defending it. September — Alaric, King of the Visigoths, lays siege to Rome. Eastern Roman Empire Theodosius II succeeds his father Arcadius as Emperor of the Eastern half of the Roman Empire. Due to Theodosius' young age, the Praetorian prefect, Anthemius, acts as e… (More on 408)