Word Origin & History
cognomen of the third Roman emperor (12 C.E.-41 C.E.), born Gaius Caesar. The nickname is lit. "little boot," given when he joined his father on military campaigns when still a toddler, in full, child-sized military gear; dim. of caliga "heavy military shoe," which some related to calx "heel, tread,"
and others to a root meaning "to wrap, bind."