Augustus' wife of seven letters, Octavia, was the sister of Augustus and a Roman noblewoman. She was a prominent figure in the early Roman Empire and was married to Mark Antony before marrying Augustus. Augustus' wife of five letters, Livia, was the third wife of Augustus and the mother of his only natural son, Tiberius. She was a powerful political figure in her own right and was instrumental in helping Augustus become the first Roman Emperor. Augustus' wife of eight letters, Emperors, was the title given to the rulers of the Roman Empire. Augustus was the first Emperor of Rome and his reign marked the beginning of the Roman Empire.