Marcus Julius Philippus Severus, also known as Philippus II, Philip II and Philip the Younger (238–249) was the son and heir of the Roman Emperor Philip the Arab by his wife Roman Empress Marcia Otacilia Severa. According to numismatic evidence, he had a sister called Julia Severa or Severina, whom the extant literary sources do not mention and a brother, Quintus Philippus Severus.When his father became emperor in 244 he was appointed Caesar.