Marcus Julius Philippus or Philippus I Arabs (c. 204 - 249), known in English as Philip the Arab or formerly (prior to World War II) in English as Philip the Arabian, was a Roman Emperor from 244 to 249.
The name of Philip's mother is unknown, but sources refer to a brother, Gaius Julius Priscus, a member of the Praetorian guard under Gordian III (238–244). In 234, Philip married Marcia Otacilia Severa, daughter of a Roman Governor. They had two children: a son named Marcus Julius Philippus Severus (Philippus II) in 238 and according to numismatic evidence they had a daughter called Julia Severa or Severina, whom the ancient Roman sources don't mention.
Philip became a member of the Pretorian Guard during the reign of the emperor Alexander Severus, who was a Syrian. In ancient Rome the Pretorian Guard was closely associated with the emperor, serving among other things as the emperor's bodyguard.
His rise from so obscure a station to the first dignities of the empire seems to prove that he was a bold and able leader. But his boldness prompted him to aspire to the throne, and his abilities were employed to supplant, not to serve, his indulgent master.
Philip was not willing to repeat the mistakes of previous claimants, and was aware that he had to return to Rome in order to secure his position with the senate. He thus travelled west, after concluding a peace treaty with Shapur I, and left his brother Priscus as extraordinary ruler of the Eastern provinces. In Rome he was confirmed Augustus, and nominated his young son Caesar and heir.
Philip's rule started with yet another Germanic incursion on the provinces of Pannonia and the Goths invaded Moesia (modern-day Serbia and Bulgaria) in the Danube frontier. They were finally defeated in the year 248, but the legions were not satisfied with the result, probably due to a low share of the plunder, if any. Rebellion soon arose and Tiberius Claudius Pacatianus was proclaimed emperor by the troops. The uprising was crushed and Philip nominated Gaius Messius Quintus Decius as governor of the province. Future events would prove this to be a mistake. Pacatianus' revolt was not the only threat to his rule: in the East, Marcus Jotapianus led another uprising in response to the oppressive rule of Priscus and the excessive taxation of the Eastern provinces. Two other usurpers, Marcus Silbannacus and Sponsianus, are reported to have started rebellions without much success.
In April 248, Philip had the honour of leading the celebrations of the one thousandth birthday of Rome, which according to tradition was founded in 753 BC by Romulus. He combined the anniversary with the celebration of Rome's alleged tenth saeculum. According to contemporary accounts, the festivities were magnificent and included spectacular games, ludi saeculares, and theatrical presentations throughout the city. In the coliseum, more than 1,000 gladiators were killed along with hundreds of exotic animals including hippos, leopards, lions, giraffes, and one rhinoceros. The events were also celebrated in literature, with several publications, including Asinius Quadratus's History of a Thousand Years, specially prepared for the anniversary.
Despite the festive atmosphere, discontent in the legions was growing. Decius (249–251) was proclaimed Emperor by the Danubian armies in the spring of 249 and immediately marched to Rome. Philip's army met the usurper near modern Verona that summer. Decius won the battle and Philip was killed, either in the fighting or assassinated by his own soldiers who were eager to please the new ruler. When the news of Decius' success reached Rome, Philip's eleven-year-old son and heir was also murdered.