Adalardus, a monk of Biandenburg, at Ghent, flourished at the beginning of the .11th century. At the request of St. Elphegus, archbishop of Canterbury, he composed an Office for the Festival of St. Dunstan. As this work is dedicated to St. Elphegus, it was probably written before 1012, the year of his martyrdom. This' work is found in many MSS., and bears sometimes the title of The Life of St. Dunstan. The epistle dedicatory is contained in Wharton's Anglia Sacra, ii, 148.