Apollos or Apollonius was a most celebrated hermit of the fourth century, who finally became the head of a monastery of five hundred brethren in the Thebaid. Some account of him is given by Palladius (Hist. Laus. c. lii.) and Rufinus (Hist. Monach. c. vii.). Cf. also Sozomen III. xiv.; and VI. xx., whence we learn that his life was written by Timothy, Bishop of Alexandria. Cassian relates another story of him in XXIV. ix.