"The Lives of the Twelve Caesars, Volume 09: Vitellius" by Suetonius is a biography written in 121 CE. This volume forms part of Suetonius's renowned collection chronicling Julius Caesar and the first eleven Roman emperors. Written while serving as secretary to Emperor Hadrian, Suetonius crafted intimate portraits of Rome's most powerful rulers. Though criticized for sensationalism and reliance on gossip, his work remains an essential primary source, offering unique details about the heritage, habits, and political careers of early imperial Rome's most influential figures. (This is an automatically generated summary.)