Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Octavius is a Latin praenomen, or personal name. It was never particularly common at Rome, but may have been used more frequently in the countryside. The feminine form is Octavia. The name gave rise to the patronymic gens Octavia, and perhaps also to gens Otacilia. A late inscription gives the abbreviation Oct. The praenomen Octavius is best known from Octavius Mamilius, the prince of Tusculum, and son-in-law of Lucius Tarquinius Superbus, the seventh and last king of Rome, who was slain by Titus Herminius at the Battle of Lake Regillus about 498 B.C. Members of gens Mamilia afterward came to Rome, and the name must have been used by the ancestors of the Octavii and perhaps the Octacilii, but examples of the praenomen are scarce. It must have been used from on occasion throughout the Roman Republic and well into imperial times. The name was used by gens Maecia, and an Octavia Valeria Vera lived at Ticinum in the second or third century A.D.; and indeed, the name has survived to the present day.