On this day in 383, eight-year-old Honorius was named Augustus by his father, Theodosius the Great. Honorius, who assumed complete rule of the West at the age of ten, would go on to be one of the most important rulers in the history of Western civilization: although Gibbon chronicles the Decline and Fall of the Roman Empire as a process lasting more than a thousand years, most historians would agree that about 80% of the decline happened under the rule of the Most Excellent and Invincible Honorius, possibly the most vincible emperor in history.