Roman historian Suetonius first introduces Claudius in his biography of Augustus, describing the boy as having various issues with his mental and physical health. Though he grew healthier after becoming emperor, "Life of Claudius" portrays him in a mixed light.

While Suetonius tells of how Claudius was the first to invade Britain in a 100 years, he also paints the man as a fool who was easily swayed by others. Though historians today perceive Claudius as a more competent ruler, this dramatic biography, peppered with omens that foreshadowed Claudius’ assassination, held primary sway over public opinion for centuries.