Jessie Penn-Lewis (18611927) was an evangelist and author from England. Born in Victoria Terrace, Neath, her father was an engineer and her grandfather was a Calvinist Methodist minister. Evan Roberts, who was instrumental in the Welsh revival in the early 1900s, stayed with Mrs. Penn-Lewis and her husband, William, for a time. Mrs. Penn-Lewis had been an eyewitness to the revival. Roberts contributed to her book War on the Saints, which was written to counter what she perceived as the excesses of the revival and the deceptions of Satan at work to prevent the true work of God in awakening. War on the Saints is considered a textbook on spiritual warfare by many Christians. Mrs. Penn-Lewis also established and edited the periodical The Overcomer.