|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. 518-549 or 554.
||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.