Question: Where was the Emperor born, under whom Rufrius Crispinus was commander of the Praetorian Guard ? 

Context articles: Rufrius Crispinus
Praetorian prefect
Nymphidius Sabinus
Praetorian Guard
Claudius
Publius Atilius Aebutianus
Tullius Crispinus
Castro Pretorio
Claudia Capitolina
Philip the Arab and Christianity

Rufrius Crispinus was an equestrian who lived during the later Julio-Claudian dynasty.
 The satirist Juvenal spitefully described him as one the "dregs" of the "Nile", indicating his Egyptian origin.
 It is believed he came to Rome as a fish merchant.
 Under the Roman Emperor Claudius he was the commander of the Praetorian Guard.
 In 47, he suppressed a rebellion and was promoted by the Senate to the rank of praetor and was given one and half a million sesterces.
Praetorian prefect (Latin: "praefectus praetorio" , Greek: ) was the title of a high office in the Roman Empire.
 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.
 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.
 The prefects again functioned as the chief ministers of the state, with many laws addressed to them by name.
 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.
 The last traces of the prefecture disappeared in the Byzantine Empire by the 840s.
Gaius Nymphidius Sabinus (c. 35–68) was a Prefect of the Praetorian Guard during the rule of Emperor Nero from 65 until his death in 68.
 He shared this office together with Gaius Ophonius Tigellinus, replacing his previous colleague Faenius Rufus.
 During the second half of the 60s, Nero grew increasingly unpopular with the people and the army, leading to a number of rebellions which ultimately caused his downfall and suicide in 68.
 Nymphidius took part in the final conspiracy against Nero and persuaded the Praetorian Guard to desert him, but when he attempted to have himself declared emperor, he was killed by his own soldiers.
In Ancient Rome, the Imperial Praetorian Guard or Praetorian Guard were a unit of the Imperial Roman Army formed of elite soldiers initially recruited in Italy.
 These units originated from the small group of men around the republican magistrates, the praetors, and those around legionary camps where the legion's command element (Latin: "Prætorium") garrisoned during campaigns.
Claudius ( ; Latin: "Tiberius Claudius Caesar Augustus Germanicus" ; 1 August 10 BC – 13 October 54 AD) was Roman emperor from 41 to 54.
 A member of the Julio-Claudian dynasty, he was the son of Drusus and Antonia Minor.
 He was born at Lugdunum in Gaul, the first (and until Trajan, the only) Roman Emperor to be born outside Italy.
 Because he was afflicted with a limp and slight deafness due to sickness at a young age, his family ostracized him and excluded him from public office until his consulship, shared with his nephew Caligula in 37.
Publius Atilius Aebutianus (died 188) was a prefect of the Roman imperial bodyguard, known as the Praetorian Guard, during the reign of emperor Commodus, from 185 until his death in 188.
 Aebutianus acceded to the office upon the execution of his predecessor Sextus Tigidius Perennis.
 According to ancient sources, Perennis was removed by the influential freedman and chamberlain of Commodus, Marcus Aurelius Cleander, and in 188 Aebutianus suffered a similar fate.
 According to the "Historia Augusta", he was murdered by Cleander, who then assumed command of the Praetorian Guard himself.
Tullius Crispinus was Praetorian Prefect with Titus Flavius Genialis in 193 AD.
 He was appointed by Didius Julianus, who had just bought the throne from the guard.
 Didius Julianus had planned to name Septimius Severus his co-emperor and sent Crispinus to deliver the offer.
 Severus killed him and thus declined the offer.
Castro Pretorio is the XVIII rione of Rome.
 Located within Municipio I, its logo is the golden banner of the Praetorian Guard on a red background.
 The rione takes its name by the ruins of the "Castrum Praetorium", the barracks of the Praetorian Guard, included in the Aurelian Walls.
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.
 Capitolina came from a distinguished family of Equestrian rank.
 She was born and raised in Alexandria, Egypt.
 Capitolina was the daughter and only child of Tiberius Claudius Balbilus by his unnamed wife.
 The cognomen "Capitolina", is probably from her maternal side.
 Her father was one of the highest magistrates of Equestrian rank that served in Rome.
 Balbilus was an astrologer and a learned scholar, who was later Prefect of Egypt.
 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.
 Her paternal cousin was Ennia Thrasylla who married the Praetorian prefect of the Praetorian Guard, Naevius Sutorius Macro.
Philip the Arab was one of the few 3rd-century Roman emperors sympathetic to Christians, although his relationship with Christianity is obscure and controversial.
 Philip was born in Auranitis, an Arab district east of the Sea of Galilee.
 The urban and Hellenized centers of the region were Christianized in the early years of the 3rd century via major Christian centers at Bosra and Edessa; there is little evidence of Christian presence in the small villages of the region in this period, such as Philip's birthplace at Philippopolis.
 Philip served as praetorian prefect, commander of the Praetorian Guard, from 242; he was made emperor in 244.
 In 249, after a brief civil war, he was killed at the hands of his successor, Decius.