Lucius Catilius Severus Julianus Claudius Reginus was a Roman senator and general active during the reigns of Trajan and Hadrian. He was appointed consul twice: the first time in 110 CE (as consul suffectus) with Gaius Erucianus Silo as his colleague; the second in the year 120 (as consul ordinarius) with the future emperor Antoninus Pius as his colleague. Catilius was also the step-great-grandfather of the emperor Marcus Aurelius.
Catilius is called Lucius Catilius Severus Julianus in Bithynian inscriptions, Lucius Catilius Severus as a consul, and Catilius Severus in literary sources. His family origins probably lie in Apamea, a town of Bithynia. In his monograph of naming practices in the first centuries of the Roman Empire, Olli Salomies notes that this polyonymous name implies an adoption, "no doubt the son of a Cn. Catilius, not the son of a Cn. Claudius adopted by a L. Catilius, in spite of the existence of senatorial Cn. Claudii Severi from Asia Minor."
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Career
The cursus honorum of Catilius Severus is preserved in an inscription recovered from Antium. His earliest recorded office was the first of the traditional republican magistracies, quaestor, which enabled him to be enrolled as a member of the Senate; in his case, he was assigned as quaestor to the province of Asia. He advanced to the traditional Roman magistracy of plebeian tribune; the fact he was praetor is omitted from this inscription, but must be presumed because it was required for the following offices Catilius is recorded as holding.
Normally a senator destined for the consulate would hold only two offices, command of a legion and governorship of a province or prefect of one of the aerarii or treasuries: Catilius held six of these. First in the list was prefectus frumenti dandi (or Prefect responsible for the distribution of Rome's free grain dole), next was legatus or assistant to the proconsular governor of Asia, then curator of an unnamed road, legatus legionis or commander of Legio XXII Primigenia, and lastly prefect of each of the treasuries, aerarium militare in the years 105 to 107, then the aerarium Saturni in 108 to 110. At this point Catilius entered his first consulate.