Wulfstan, also known as Wulfstan II or Lupus, was an influential figure in English ecclesiastical history. He held the positions of Bishop of London, Bishop of Worcester, and Archbishop of York. Believed to have begun his religious vocation as a Benedictine monk, he assumed the role of Bishop of London in 996. In 1002, he was elected to both the diocese of Worcester and the archdiocese of York simultaneously, overseeing both until 1016 when he relinquished Worcester, but continued as archbishop of York until his passing. It was during his time in London that he gained recognition as a notable sermon writer, particularly addressing the subject of Antichrist. In 1014, as the archbishop, he authored his most renowned work, a homily titled the Sermo Lupi ad Anglos, or the Sermon of the Wolf to the English.
Aside from his prolific sermons, Wulfstan played a significant role in formulating legal codes for two English kings, Æthelred the Unready and Cnut the Great. He is regarded as one of the prominent writers of the late Anglo-Saxon period in England. Following his demise in 1023, reports of miracles associated with his tomb circulated, yet attempts to canonize him as a saint did not come to fruition.