Question: What was the birth name of the emperor under whom Naevius Sutorius Macro served as prefect of the Praetorian Guard?

<P0-S0> Caligula ( ), properly Gaius Julius Caesar Augustus Germanicus (31 August AD 12 – 24 January AD 41) was Roman emperor from AD 37–41. <P0-S1>  Born Gaius Julius Caesar Germanicus (not to be confused with Julius Caesar), Caligula was a member of the house of rulers conventionally known as the Julio-Claudian dynasty. <P0-S2>  Caligula's biological father was Germanicus, and he was the great-nephew and adopted son of Emperor Tiberius. <P0-S3>  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. <SEP> <P1-S0> Praetorian prefect (Latin: "praefectus praetorio" , Greek: ) was the title of a high office in the Roman Empire. <P1-S1>  Originating as the commander of the Praetorian Guard, the office gradually acquired extensive legal and administrative functions, with its holders becoming the Emperor's chief aides. <P1-S2>  Under Constantine I, the office was much reduced in power and transformed into a purely civilian administrative post, while under his successors, territorially-defined praetorian prefectures emerged as the highest-level administrative division of the Empire. <P1-S3>  The prefects again functioned as the chief ministers of the state, with many laws addressed to them by name. <P1-S4>  In this role, praetorian prefects continued to be appointed until the reign of Heraclius in the 7th century AD, when wide-ranging reforms reduced its power and converted it to a mere overseer of provincial administration. <P1-S5>  The last traces of the prefecture disappeared in the Byzantine Empire by the 840s. <SEP> <P2-S0> Quintus Naevius Cordus Sutorius Macro (21 BC – 38 AD) was a prefect of the Praetorian Guard, from 31 until 38, serving under the Roman Emperors Tiberius and Caligula. <P2-S1>  Upon falling out of favor, he committed suicide. <SEP> <P3-S0> Claudia Capitolina (Greek: η Κλαuδία Καπιτωλίνα ) was an Egyptian Greek woman who lived in the Roman Empire, in the 1st century and possibly in the 2nd century. <P3-S1>  Capitolina came from a distinguished family of Equestrian rank. <P3-S2>  She was born and raised in Alexandria, Egypt. <P3-S3>  Capitolina was the daughter and only child of Tiberius Claudius Balbilus by his unnamed wife. <P3-S4>  The cognomen "Capitolina", is probably from her maternal side. <P3-S5>  Her father was one of the highest magistrates of Equestrian rank that served in Rome. <P3-S6>  Balbilus was an astrologer and a learned scholar, who was later Prefect of Egypt. <P3-S7>  Capitolina’s paternal grandfather, was an Egyptian Greek Grammarian and Astrologer called Thrasyllus of Mendes or Tiberius Claudius Thrasyllus, who was a friend of the Roman Emperor Tiberius, while her paternal grandmother was Greek Princess Aka II of Commagene, who was a great, granddaughter of King Antiochus I Theos of Commagene. <P3-S8>  Her paternal cousin was Ennia Thrasylla who married the Praetorian prefect of the Praetorian Guard, Naevius Sutorius Macro.