De vita caesarum, or 'On the Life of the Caesars', is a historical work by Suetonius that provides biographical accounts of the first twelve emperors of Rome. This text is significant as it blends history with biography, offering insights into the personal lives, character traits, and political actions of these rulers, highlighting both their achievements and failures. Suetoniusโs approach to Roman historiography emphasizes the importance of individual character in shaping historical events.