Under King Canute, he was enshrined at Canterbury in 1023. Later, the Norman archbishop Lanfranc suspended the celebration, questioning whether Alphege was actually a martyr for the faith. The answer, supplied by St. Anselm, was that, like St. John the Baptist, Alphege was a martyr for justice and truth; the feast was then duly restored. By an act of prescience, St. Thomas Becket, in his last sermon at Canterbury before his murder, praised Alphege as the first Canterbury martyr.
I am grateful to the the website of The Sacret Heart Parish, Waterlooville for the above text and to Orthodox England for the icon of St Alphege.