The revival of Swithun's fame gave rise to a mass of legendary literature. The so-called "Vita S. Swithuni" of Lantfred and Wulfstan, written about 1000, hardly contains any biographical fact; all that has in later years passed for authentic detail of Swithun's life is extracted from a late eleventh-century hagiography ascribed to Goscelin of St Bertin's, a monk who came over to England with Hermann, bishop of Salisbury from 1058 to 1078. According to this writer Saint Swithun was born in the reign of Egbert of Wessex, and was ordained priest by Helmstan, bishop of Winchester (838-c. 852). His fame reached the king's ears, and he appointed him tutor of his son, Æthelwulf (alias Adulphus), and considered him one of his chief friends. However, Michael Lapidge describes the work as "pure fiction" and shows that the attribution to Goscelin is false.