Amphibalus
Amphibalus is a venerated early Christian priest said to have converted Saint Alban to Christianity. He occupied a place in British hagiography almost as revered as Alban himself. According to many hagiographical accounts, including those of Gildas, Bede, Geoffrey of Monmouth, and Matthew of Paris, Amphibalus was a Roman Christian fleeing religious persecution under Emperor Diocletian. Amphibalus was offered shelter by Alban in the Roman city of Verulamium, in modern-day England. Alban was so impressed with the priest's faith and teaching that he began to emulate him in worship, and eventually became a Christian himself. When Roman soldiers came to seize Amphibalus, Alban put on Amphibalus' robes and was punished in his place. According to Matthew Paris, after Alban's martyrdom, the Romans eventually caught and martyred Amphibalus as well.

Name and authenticity
Gildas (), Bede () and the three texts of Alban's Passio, going back as far as the 5th century, do not name Amphibalus in their accounts of Alban. They refer to Amphibalus not as a saint but simply as a priest and do not report his martyrdom. Amphibalus gained his name and title when Geoffrey of Monmouth wrote his  (History of the Kings of Britain) in the 12th-century. It is possible that Geoffrey had been repeating a name for the priest that had come into common usage in his time, but it is also possible that Geoffrey misunderstood the Latin word used for the cloak, amphiboles, which was worn by Alban.

Wilhelm Levison noted that the story of the name, which goes back to a 5th-century Passio Albani, is composed of borrowings from other lives of saints and it has, in his words, "no place in the ranks of Acta martyrum sincera; it is a legendary tale...."

Geoffrey of Monmouth
Geoffrey repeated the story of Alban's martyrdom as given by Bede in his famous Historia Regum Britanniae (c. 1136), with the addition of the name of the confessor he shelters, Amphibalus. He recounts a church of Amphibalus at Winchester where King Constantine consigned his son, Constans, to become a monk and where another, later, Constantine killed one of the sons of Mordred. Geoffrey may have gotten the name from Gildas, who describes his contemporary, Constantine, King of Dumnonia, as having dressed in the amphibalo, or 'cloak', of an abbot to murder two royal youths in a church. This could also be the inspiration for Geoffrey's story about the murder of the son of Mordred, and his association of Amphibalus' church with kings called Constantine. How, or why the story about Alban became connected to the story of king Constantine remains somewhat mysterious, but might be an effect of Geoffrey's enterprising imagination, and confusion of sources.

New cult invented in 12th-century
Other details about Amphibalus's cult originate with texts that appear to have been written with the purpose of creating a new cult, particularly to give a supportive context to the inventio, or  'discovery', of the body of Amphibalus at Redbourn, near St Albans in 1177. The texts were produced at St Albans Abbey in the second half of the 12th-century written by a monk, William of St Albans, during the abbacy of Simon (1167–1183). He provided an elaborate version of the story of Saint Alban and gave a prominent role in it to a new martyr-saint, Amphibalus, whose name he states to have found in Geoffrey's work.

Wilhelm Levison, stated that: "The abbey had incurred heavy debts; anyone who knows the medieval misuse of pious belief and offering, will not be surprised to learn that just at this time the generosity of the devotees was stimulated by the discovery of the history and, what is more, of the relics of St Amphibalus." Benjamin Gordon-Taylor also suggests that "a principal motive for the initiation of the cult of St Amphibalus was the success of the cult of St Thomas of Canterbury”  (murdered in 1170).

The new story about Amphibalus that emerged (see below) is based on associations with Saint Alban. Wilhelm Levison noted, that in the 6th-century account of Gildas were another two martyrs, Julius and Aaron, said to have been martyred together by the 8th-century at Urbs Legionis, identified as Caerleon in Wales. Meanwhile, the large number of people supposedly martyred together with Amphibalus may have their origin in a mistranscription made in the course of the transmission of the Martyrologium Hieronymianum (St Jerome's Martyrology), which connected the large number of martyrs originally associated with Rufinus of Alexandria, with Alban, under the date of 22 June.

The location of the inventio at Redbourn was discovered near ancient Anglo-Saxon burial mounds. There were two knives said to have been found with Amphibalus, typical of an ancient pagan Anglo-Saxon burial.

Gordon-Taylor notes that: "The cult of St. Amphibalus and his companions is unique in late twelfth-century England ... in that we are seeing a cult beginning almost from scratch." This phenomenon bears witness to the influence of Geoffrey of Monmouth's Historia Regum at the time which lay behind the discovery of the grave of King Arthur at Glastonbury Abbey. This was around the same time that the bodies of Amphibalus and his companions were discovered, which Gordon-Taylor suggests was also motivated in part by competition with the new Canterbury cult of St Thomas Becket to gain pilgrims.

Hagiography
Most of what is known of Amphibalus's life is derived from hagiographic texts centred on Alban, written hundreds of years after his death. He was believed to be a citizen of Caerleon during the 3rd or 4th century. During a religious persecution, Alban sheltered Amphibalus from persecutors in his home. The priest was believed to be pious and faithful, and while in Alban's home he prayed and kept watch day and night. He instructed Alban with "wholesome admonitions", influencing Alban to abandon his previous religious beliefs and follow Amphibalus in the Christian faith. Alban was so inspired by his guest that he chose to sacrifice his own life in order to save Amphibalus.  

After the martyrdom of Alban, Amphibalus was believed to have returned to Caerleon, where he converted many others to Christianity, including the saints Julius and Aaron. It is believed that he was eventually captured by the Romans and returned to Verulamium, where he was killed for his faith. Where and how he was killed is unclear. Some sources say he was beheaded others say he was stabbed. A later version of the legend says that Amphibalus and some companions were stoned to death a few days afterwards at Redbourn, four miles from St. Albans. Amphibalus is known for being one of four martyrs of the early Christian church in Roman Britain along with Albus, Julius and Aron. There is little known about any of the four early saints except that they seemed to all be acquainted with each other.

In 1178, some 800 years after Amphibalus' traditional death date, his remains were discovered at Redbourn in Hertfordshire, England, near the town of St Albans. According to the tale, Saint Alban appeared in a vision to a monk named Robert, indicating that he wished to make the location of the remains of Amphibalus known. Robert followed the spirit of Alban and was led by the saint to the remains of Amphibalus and his companions. Healing miracles were performed immediately, and the abbot ordered the site to be excavated. Several bodies were discovered, and one body seemed consistent with the manner of Amphibalus' death. The body believed to belong to Amphibalus was moved to St Alban's, where a shrine was constructed for the veneration of the relics.

Veneration
The first shrine of St Amphibalus stood before the Great Rood Screen in the Norman Abbey of St Alban's, near the high altar on the north side of the shrine of St Alban. In 1323, a portion of the abbey roof collapsed, damaging the shrine. The shrine was then moved to the north aisle of the chancel. Eventually, around 1350, the shrine was given a position in the centre of the retrochoir, east of St Alban's own shrine in the 'Saint's Chapel', complete with a stone tomb, paintings, and a silver gilt plate.

The shrine was destroyed during the Dissolution of the Monasteries under Henry VIII and the pieces were used to block the eastern arches of "Saints' Chapel". The relics were scattered; however, the remains of the shrine were discovered in the 19th-century during renovations, and were reassembled in 1872 under the direction of Sir George Gilbert Scott. The stone shrine was restored in 2021 by the Skillington Workshop and can be seen in St Albans Cathedral. The shrine features a new masked figure to commemorate its reconstruction during the Covid pandemic.

Traditionally, Amphibalus' feast day was held on 22 June. Winchester Cathedral was under the patronage of St Amphibalus before it was dedicated to St Swithin circa the year 971, so there has to be, if not doubt, a question in the context of the source and chronology of the much later cult of Amphibalus.

References

External links 
 Village of Redbourn homepage
 Wall, J. Charles, Shrines of British Saints, Methuen & Co., London 1905

304 deaths
Welsh saints
History of St Albans
Romano-British saints
Burials in Hertfordshire
4th-century Christian clergy
4th-century Christian martyrs
4th-century Romans
Year of birth unknown