Who is Julia from The Twelve Caesars and what is their importance?

Julia is Augustus' daughter. She is very promiscuous and never pleases her father. Many times he wishes she were dead. She is banished to an island for years, then is allowed to come back to the mainland. She marries Tiberius, though they are divorced by Augustus after she is unfaithful to him. When her father dies, he ensures that she will not be buried in the family's mausoleum.