The Roman Empire was founded in 27 BC with Augustus as its first emperor. It reached its greatest territorial extent under Emperor Trajan in 117 AD. In 395 AD, the empire was divided into Western and Eastern halves. The Western Roman Empire collapsed in 476 AD, while the Eastern Roman Empire, also known as the Byzantine Empire, continued for another thousand years, finally falling in 1453 AD. Which of the following events occurred AFTER the division of the empire but BEFORE its final collapse?
A) Augustus became the first emperor.