He might be identified with the historical character behind the myth of Saint Gallicanus, who died, according to tradition, in 362, and whose day is June 25.
A Gallicanus is known to have donated to the church of the Saints Peter, Paul, and John the Baptist in Ostia lands worth 869 solidi per year.
According to the unreliable Acts of Saint Gallicanus (in "Acta SS.
After his conversion to Christianity he retired to Ostia, founded a hospital and endowed a church built by Constantine I.
Under Julian the Apostate he was banished to Egypt, and lived with the hermits in the desert.