 Dunstan ( Latin : <unk> ; 909 – 19 May 988 AD ) was an Abbot of Glastonbury Abbey , a Bishop of Worcester , a Bishop of London , and an Archbishop of Canterbury , later canonised as a saint . His work restored monastic life in England and reformed the English Church . His 11th @-@ century biographer , Osbern , himself an artist and scribe , states that Dunstan was skilled in " making a picture and forming letters " , as were other clergy of his age who reached senior rank . 
