Two early lives of Severos, Patriarch of Antioch - Zacharias, Bishop of Mytilene; Brock, Sebastian P.; Fitzgerald, Brian (Brian Ephrem) (Liverpool University Press, 2013)
The first work was written by Zacharias Scholastikos, also known as Zacharias, Bishop of Mytilene; the second work is anonymous, but has been attributed to John of Beth Aphtonia.