History of the Church of England are known to have been present at the Council of Arles (314). Others attended the Council of Serdica in 347 and that of Ariminum in 360. A number of references to the church in Roman Britain are also found in the writings of 4th century Christian fathers. Britain was the home of Pelagius, who opposed Augustine of Hippo's doctrine of original sin. The first recorded Christian martyr in Britain, St Alban, is thought to have lived in the early 4th century, and his prominence in English hagiography is reflected in the number of parish churches of which he is patron.
Placidus (martyr) martyred with thirty companions. The feast day of the martyr saints was not in the Tridentine Calendar, but was included in the General Roman Calendar from its 1588 to 1962 editions for celebration on 5 October, the feast day of the two monks who were disciples of Saint Benedict of Nursia from their boyhood, Saint Maurus and Placidus. Some traditionalist Catholics continue to observe pre-1970 calendars. Placidus (martyr) Saint Placidus (Placitus), along with Saints Eutychius (Euticius), Victorinus and their sister Flavia, Donatus, Firmatus the deacon, Faustus, and thirty others, have been venerated as Christian martyrs. They were said to be