This Old English edict, which claims to be an additional treaty between King Alfred of Wessex (872–899), his son Edward the Elder, king of Wessex and Mercia (899–924), and Guthrum, the viking king of East Anglia (d.889/90), was identified by Dorothy Whitelock as a forgery, composed by Archbishop Wulfstan of York (1002–1023). Wulfstan may possibly have fabricated this treaty in an attempt to seek security for the Church in northern England once he became archbishop by reaffirming traditional rights and penalties regarding church sanctuary, crimes in which the Church has an interest, the responsiblities of priests, tithes, fasting, Sunday-work, and sorcery.