Brut described himself as "a sinner, a layman, a farmer and a Christian" in his trial for heresy which took place on 3 October 1393 before the Bishop of Hereford, Thomas Trefnant. He is mentioned in the medieval English poem Piers Plowman. About the year 1402 he joined the forces of Owain Glyndŵr.
It seems then that this Walter Brute, by nation a Briton or Welsh-man, who was “a layman and learned, and brought up in the University of Oxford, being there a graduate,” was accused of saying, among sundry other things, that “the Pope is Antichrist, and a seducer of the people, and utterly against the law and life of Christ.” Being called to answer, he put in first certain more brief “exhibits:” then “another declaration of the same matter after a more ample tractation;” ex-plaining and setting forth from Scripture the grounds of his opinion. In either case his defense was grounded very mainly on the Revelation. For he at once bases his justification on the fact, as demonstrable, of the Pope answering alike to the chief of the false Christs prophesied of by Christ, as to come in his name; to the Man of Sin prophesied of by St. Paul: the city of Papal Rome answering also similarly to the Apocalyptic Babylon.
- Theology of the Sacrament of the Altar
- Herbert B. Workman (10 August 2012). John Wyclif: A Study of the English Medieval Church, Volume 2. Wipf and Stock Publishers. p. 337. ISBN 9781620325704.
- Elliot, E.B. (1862). "Appendix: History of Apocalyptic Interpretation". Horae Apocalypticae Vol. IV Sup. p. 143. ISBN 9781365493379.
- Pedersen, Olaf. "Bryt, Walter". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/3454. (Subscription or UK public library membership required.)