Henry James Warner

Available public-domain and library records identify him as an English cleric who lived from 1862 to 1953. He is associated most clearly with The Albigensian Heresy (1922), a study of the medieval Cathars or Albigensians that has remained the work most often linked to his name.

The surviving record online is fairly sparse, but it suggests a writer shaped by religious scholarship and historical inquiry rather than by a large popular literary career. His work was published by the Society for Promoting Christian Knowledge, which fits the picture of a churchman writing for readers interested in theology and church history.

Because biographical information on him is limited in the sources I could confirm, many personal details about his life and career remain unclear. What does stand out is his contribution to accessible religious history: a serious look at medieval heresy written from the perspective of an early 20th-century Christian scholar.