Augustine_of_Canterbury Augustine of Canterbury (c. first third of the 6th century – 26 May 604) was a Benedictine monk who became the first Archbishop of Canterbury in the year 598. He is considered the "Apostle to the English" and a founder of the English Church.Augustine was the prior of a monastery in Rome when Pope Gregory the Great chose him in 595 to lead a mission, usually known as the Gregorian mission, to Britain to convert the pagan King Æthelberht of the Kingdom of Kent to Christianity.