Flavius Honorius (9 September 384 – 15 August 423) was Roman emperor from 393 to 423. He was the younger son of emperor Theodosius I and his first wife Aelia Flaccilla, and brother of Arcadius, who ruled the eastern half of the empire from 395, when their father died, until his death in 408. In 410, during Honorius's reign over the western Roman Empire, Rome was sacked for the first time in almost 800 years.