Question: What was the birth name of the emperor under whom Naevius Sutorius Macro served as prefect of the Praetorian Guard?
Sentence (from "Caligula"): The young Gaius earned the nickname "Caligula" (meaning "little soldier's boot", the diminutive form of "caliga", hob-nailed military boot) from his father's soldiers while accompanying him during his campaigns in Germania.
Relevant evidence: No