For All the Saints
- Paragraph on St. Gallicanus (of Ostia). Mentions only one St. Gallicanus of Embrun, and makes him the fifth bishop of that see.
- http://www.saintpatrickdc.org/ss/0625.htm#gale

Catholic Encyclopedia
- Three saints named Gallicanus share 25 June as their feast day. St. Gallicanus (of Ostia) was a Roman martyr in Egypt, c. 363. St. Gallicanus I, was seventh bishop of Embrun, fl. 524-529. And St. Gallicanus II was the ninth bishop of Embrun from c. 518-5
- http://www.newadvent.org/cathen/06365a.htm