A. J. (Augustine J.) O'Reilly

Available sources identify him as Augustine J. O'Reilly, often listed as A. J. O'Reilly, and show that he wrote religious and historical works centered on early Christianity and Roman persecution. Catalog and library records connect his name with books such as The Martyrs of the Coliseum, The Victims of the Mamertine, and Alvira: The Heroine of Vesuvius.

The surviving public record appears to be quite thin, so biographical details about his life are hard to confirm. What can be said with confidence is that his work has remained in circulation through library catalogs, reprints, and public-domain editions, suggesting a lasting readership for his dramatic, faith-centered storytelling.

Some booksellers and editions also style him as "Rev. A. J. O'Reilly," but without stronger confirming evidence, it is safest to treat that as probable rather than certain.