of Calama, Bishop Possidius. Vita Sancti Augustini (Life of Saint Augustine). AD 439:

Weiskotten, Herbert T, ed and tr. Sancti Augustini Vita scripta a Possidio Episcope (Edited with Revised Text, Introduction, Notes, and An English Version). Princeton: Princeton University Press, 1919.
https://ia800200.us.archive.org/6/items/sanctiaugustiniv00possrich/sanctiaugustiniv00possrich.pdf