For All the Saints
- Very brief note on St. Possidius suggests 450 as the year of the saint's death.
- http://www.saintpatrickdc.org/ss/0516.htm#poss

Catholic Encyclopedia
- St. Possidius, bishop of Calama, was a friend of St. Augustine for 40 years, and wrote a short life of Augustine. Dates of birth and death are uncertain. Possidius was consecrated as bishop in 397, and published his life of Augustine in about 438.
- http://www.newadvent.org/cathen/12318a.htm