not Agellius as Lipsius and others have imagined, a Latin grammarian, with regard to whose history we possess no source of information except his own book. From this we gather that he was of good family and connections, a native probably of Rome; that he had travelled much, especially in Greece, and had resided for a considerable period at Athens; that he had studied rhetoric under T. Castricius and Sulpicius Apollinaris, philosophy under Calvisius Taurus and Peregrinus Proteus, enjoying also the friendship and instructions of Favorinus, Herodes Atticus, and Cornelius Fronto; that while yet a youth he had been appointed by the praetor to act as an umpire in civil causes; and that subsequently much of the time which he would gladly have devoted to literary pursuits had been occupied by judicial duties of a similar description. The precise date of his birth, as of his death, is unknown; but from the names of his preceptors and companions we conclude that he must have lived under Hadrian, Antoninus Pius, and M. Aurelius, A. D. 117-180.
[W.R]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890