Ulpian
He was one of the five jurists upon whom decisions were to be based according to the Law of Citations of Valentinian III,[3] and supplied the Justinian Digest about a third of its contents.He made his first appearance in public life as assessor in the auditorium of Papinian and member of the council of Septimius Severus; under Caracalla he was master of the requests (magister libellorum).Elagabalus (also known as Heliogabalus) banished him from Rome, but on the accession of Severus Alexander (222) he was reinstated, and finally became the emperor's chief adviser and Praefectus Praetorio.As an author, he is characterized by doctrinal exposition of a high order, judiciousness of criticism, and lucidity of arrangement, style, and language.Robert Lee Cleve makes a compelling case that Ulpian died in 223, citing a papyrus discovered in 1966.