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.
Submitted in section: Religion & Spirituality: Christianity: People: Saints: G: Saints Gallicanus: Catholic Encyclopedia