The life of Saint John Cassian the Roman

360, probably in Dobruje, Romania. Around 380 he and his friend  Germanus went to visit the Palestinian holy places. While  in Bethlehem, they decided to become monks, but eventually they migrated to Egypt where monasticism was better developed.

Scete  to learn about the monastic life. Around 400  Cassian  went to Constantinople and studied under St. Jonh Chrysostom. Chrysostom ordained  Cassian  a deacon. 
Later when Chrysostom was condemned, Cassian  went to Rome  to defend  him before  Pope  St. Innocent. Some believe that Cassian was ordained in Rome, but he dropped from sight for a time after his Rome experience.
When Cassian later surfaced in Marseilles, he founded a monastery for   men and women.  His communities clearly characterized by the monastic style of Egypt.

France.
St.Benedict  recommended Cassian's works as authoritative  resourse  on the training of monks. Cassian died in Marseilles around 435.

simple, direct style. They were swiftly translated into Greek, which indicates the Eastern monks recognized him as one of their own, among which:
- CONFERENCES WITH THE FATHERS in twenty-four chapters;
- THE INSTITUTES OF CENOBITIC LIFE in twelve books;
- ON THE INCARNATION OF THE LORD, AGAINST NESTORIUS (De Incarnationem Domini Contra Nestorium) in seven books.