- Gaius Caesar, a.d. 12–41, emperor of Rome 37–41.
- original name Gaius Caesar, son of Germanicus. 12–41 ad, Roman emperor (37–41), noted for his cruelty and tyranny; assassinated
cognomen of the third Roman emperor (12 C.E.-41 C.E.), born Gaius Caesar. The nickname is Latin, literally “little boot,” given when he joined his father on military campaigns when still a toddler, in full, child-sized military gear; diminutive of caliga “heavy military shoe,” of unknown origin.