He was born around 400 in Bethelia, a small town near Gaza, into a wealthy Christian family of Palestine. What he has to tell us of the history of Southern Palestine was derived from oral tradition. He appears familiar with the region around Gaza, and mentions having seen Bishop Zeno of Majuma, the seaport of Gaza.
Grandfather
Sozomen wrote that his grandfather lived at Bethelia, near Gaza, and became a Christian together with his household, probably under Constantius II. A neighbor named Alaphrion was miraculously healed by Saint Hilarion who cast out a demon from Alaphrion, and, as eyewitnesses to the miracle, his family converted, along with Alaphrion's. The conversion marked a turning-point in the Christianization of southern Palestine, according to his account. The grandfather became within his own circle a highly esteemed interpreter of Scripture. The descendants of the wealthy Alaphrion founded churches and convents in the district, and were particularly active in promoting monasticism. Sozomen himself had conversed with one of these, a very old man. He tells us that he was brought up under monkish influences and his history bears him out.
Life and career
Education
Sozomen seems to have been brought up in the circle of Alaphrion and acknowledges a debt of gratitude to the monastic order. His early education was directed by the monks in his native place. It is impossible to ascertain what curriculum he followed in these monastic schools, but his writings give clear evidence of the thoroughness with which he was grounded in Greek studies. As a man he retained the impressions of his youth, and his great work later was to be also a monument of his reverence for the monks in general and for the disciples of Hilarion in particular.
Book II: from the Council of Nicea to Constantine's death
Book III: from the death of Constantine I to the death of Constans I
Book IV: from the death of Constans I to the death of Constantius II
Book V: from the death of Constantius II to the death of Julian the Apostate
Book VI: from the death of Julian to the death of Valens
Book VII: from the death of Valens to the death of Theodosius I
Book VIII: from the death of Theodosius I to the death of Arcadius.
Book IX: from the death of Arcadius to the accession of Valentinian III.
Book IX is incomplete. In his dedication of the work, he states that he intended cover up to the 17th consulate of Theodosius II, that is, to 439. The extant history ends about 425. Scholars disagree on why the end is missing. Albert Guldenpenning supposed that Sozomen himself suppressed the end of his work because in it he mentioned the Empress Aelia Eudocia, who later fell into disgrace through her supposed adultery. However, it appears that Nicephorus, Theophanes, and Theodorus Lector actually read the end of Sozomen's work, according to their own histories later. Therefore, most scholars believe that the work actually came down to that year and that consequently it has reached us only in a damaged condition.
Other writings
According to historian and scholar of Islam Michael Cook, Sozomen wrote that a group of "Saracens" in Palestine had adopted Jewish laws and customs after coming into contact with Jews and may have been the forerunners of Islam and Muslims.
Publication
The work of Sozomen was first printed by Robert Estienne at Paris in 1544,