Information:  - Cassius Dio or Dio Cassius was a Roman statesman and historian of Greek origin. He published 80 volumes of history on Ancient Rome, beginning with the arrival of Aeneas in Italy. The volumes documented the subsequent founding of Rome (753 BC), the formation of the Republic (509 BC), and the creation of the Empire (31 BC), up until 229 AD. Written in Ancient Greek over 22 years, Dio's work covers approximately 1,000 years of history. Many of his 80 books have survived intact, or as fragments, providing modern scholars with a detailed perspective on Roman history.  - Aelius Herodianus ( Greek :   ) or Herodian ( fl . 2nd century CE ) was one of the most celebrated grammarians of Greco - Roman antiquity . He is usually known as Herodian except when there is a danger of confusion with the historian also named Herodian . He was the son of Apollonius Dyscolus and was born in Alexandria . From there he seems to have moved to Rome , where he gained the favour of the emperor Marcus Aurelius , to whom he dedicated a work on prosody .  - Elagabalus , also known as Heliogabalus (203  March 11, 222), was Roman emperor from 218 to 222. A member of the Severan dynasty, he was Syrian, the second son of Julia Soaemias and Sextus Varius Marcellus. In his early youth he served as a priest of the god Elagabal in the hometown of his mother's family, Emesa. As a private citizen, he was probably named Sextus Varius Avitus Bassianus. Upon becoming emperor he took the name Marcus Aurelius Antoninus Augustus. He was called Elagabalus only after his death.  - Herodian or Herodianus of Syria, sometimes referred to as "Herodian of Antioch" (c. 170  c. 240), was a minor Roman civil servant who wrote a colourful history in Greek titled "History of the Empire from the Death of Marcus" (    ) in eight books covering the years 180 to 238. His work is not entirely reliable although his relatively unbiased account of Elagabalus is more useful than that of Cassius Dio. He was a Greek (perhaps from Antioch) who appears to have lived for a considerable period of time in Rome, but possibly without holding any public office. From his extant work, we gather that he was still living at an advanced age during the reign of Gordianus III, who ascended the throne in 238. Beyond this, nothing is known of his life.    Given the information, choose the subject and object entities that have the relation of 'date of birth'.
aelius herodianus , 180